The real, unequivocal end is here.
But not before Harmon. No, nothing is before him. Not even the Queen.... anymore.
Harmon's age makes you look at ancient Egypt and think; "Perhaps you're not as old as I thought". To him, Egypt is like a toddler. The Romans? Baby. The U.S.? Fetus. Us normal folk cannot fathom such an age.
The aliens, the egyptians, it all was telling him what his fate must be. A history teacher. One who documents the events he hath been through, from the birth of the universe to the Cambrian explosion to Young Sheldon airing on CBS. He went through it all.
returned to Boomerland that evening enlightened. Ready to start anew.