[YetAnotherMatt]

One more factor I would recommend to take into account is when the store restocks.

For where I live, the supermarket I usually go to always restocks Tuesday mornings, sometimes on Thursday mornings.

This may be a bit selfish, but I always go on Tuesday morning 10AM and it has not been crowded do far, and I've had zero issues with needing repeated trips due to groceries being out of stock.

EDIT: One would expect it to be busier right after / during restocking, but that has not been the case at all. Maybe the supermarket has an incentive to restock during the least busy times or people have not caught on in general yet.