This is a position that can be done throughout the week, although Sundays and Wednesdays are preferred because produce is delivered the following day.
Priorities:
Toss old or mis/unlabeled food - this includes anything that is over 7 days old, any food that is unlabeled/improperly labelled/without a lid.
Get anything off the floor - such as foods that the dairy delivery drops off on Friday night. Everything should be unpacked and put in its place.
Product rotation to prevent spoilage - when you are stocking the dairy, the oldest dairy should be in the front, and the newest in the back. Same with produce/salad.
Floor clean - Once a week, you should sweep the floor and wash it with degrade degreaser.
Organize food for easy house member access - try to group foods together and tidy up.
Any cardboard that you remove (and you should be removing lots) should be broken down and taken out to the cardboard dumpster.