This below scene repeated so many times at the beginning of the movie:
What's the significance of repeating this scene in Nobody (2021)?
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It's fairly standard movie shorthand for
"This is my boring life. I do the same things every day, every week."
It tells you a lot about his life in a quick shorthand way.
He has a dull job as something to do with figures at an industrial factory. He has scheduling issues - he can't remember to take out the garbage in time. His wife and son really don't have much time for him. He exercises regularly.
That's quite a lot of personal life that they manage to tell us in about one minute.
It also, presumably quite intentionally, tells you nothing about his past or any hint as to what the opening pre-credit sequence has to do with it.