No one knows when Jesus will come again. Only the Father knows.
Jesus said, "But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father alone" (Matthew 24:36).
However, we are much closer everyday to the end than ever before. With over 8 billion people on earth, the earth itself cannot keep sustaining the increase of so many people.
And many prophecies have come true in modern times:
1. Israel back as a nation. This happened in one day on May 14, 1948 as prophesied in Isaiah 66: "Shall a land be born in one day? Shall a nation be brought forth in one moment? For as soon as Zion was in labor she brought forth her children" (Isaiah 66:8). Israel is brought back as a nation after being in labor pains during the Holocaust. When Jesus comes to reign on earth, at that time, "all Israel will be saved" (Romans 11:19-26).
2. Wars - “You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come” (Matthew 24:6). "Nation will rise against nation and kingdom against kingdom..." (Luke 21:10).
We have had World War I and World War II. And also rumors of wars (like the Cold War in the 1970s between Russia and US when those countries raced one another to develop weapons of mass destruction). Today, we have wars in various places. Jesus' prophecy of wars before His coming has already been fulfilled.
3. Gospel preached everywhere. “And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come” (Matthew 24:14).
Today we are able to reach everyone on earth through the internet. In fact, many online ministries are reaching people all over the world through social media and email with the gospel. We can reach people in closed nations that don't allow evangelism by going through the internet. This was not possible even 100 years ago. This prophecy is being fulfilled as we speak.
4. Increased travel and knowledge. “But as for you, Daniel, conceal these words and seal up the book until the end of time; many will go back and forth, and knowledge will increase” (Daniel 12:4).
a. Nowadays, many people GO QUICKLY BACK AND FORTH in their travels by planes, trains, ships, and cars. People can go around the world in one day by plane.
b. KNOWLEDGE HAS INCREASED dramatically via the internet. Anyone can find out anything through a search online.
5. Persecution - "But before all these things, they will lay their hands on you and will persecute you, delivering you to the synagogues and prisons, bringing you before kings and governors for My name’s sake." (Luke 21:12)
Persecution against Christians happened since the time of Jesus with His disciples to today. Persecution against Christians is very bad in certain nations around the world. 1 out of 8 Christians live in persecution globally.
6. Earthquakes, plagues, and famines - "...There will be great earthquakes, and in various places plagues and famines" (Luke 21:11)
A worldwide plague happened recently with COVID. And there are several major earthquakes per year in various places around the world. Famine also occurs in many places.
7. False teaching
"See to it that no one misleads you. For many will come in My name, saying, ‘I am the Christ,’ and will mislead many." (Matthew 24:4-5)
"They will say to you, ‘Look there! Look here!’ Do not go away, and do not run after them. For just like the lightning, when it flashes out of one part of the sky, shines to the other part of the sky, so will the Son of Man be in His day." (Luke 17:23-24)
Many false teachers will come with the doctrine of demons and perform signs and miracles to mislead many. Some of this is already happening as witchcraft is one type of this teaching, and is increasing around the around.
From ancient times in Egypt, various magicians used their dark arts to perform miracles, even trying to match God's miracles. For example, pharaoh's magicians were able to turn water into blood (Exodus 7:22) and summon frogs (Exodus 8:7) - two of the same signs God performed.
Some non-believers turn to magic and dark arts, which are demonic teachings. The demons themselves are powerful fallen angels who once saw how God performed miracles before their fall. So they have power and knowledge from previous times, and are able to perform some signs and wonders themselves. And they teach these things to humans.
Jesus said, "For false Christs and false prophets will arise and will show great signs and wonders, so as to mislead, if possible, even the elect." (Matthew 24:24).
So be careful of any doctrine that is contrary to the Bible, so that you don't fall away but endure to the end.
"But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons..." (1 Timothy 4:1)
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As you can see, we are very close to Jesus coming again. He could come at any time! It's time to be prepared by having a close relationship with God and focusing on Him.
Read about what Jesus said regarding His second coming: https://www.bible.com/bible/100/MAT.24.NASB1995