Then you're looking at a street scene first off. Cars, bicycles, dog shit etc. MC can be on the phone, or thinking, or whatever as set-up scene. MC can cough due to smoke, or admire architecture, or see someone who attracts them etc.
Then you can go into why they're going to the market(wine for party later that night, ice cream for the kids, tuna for the cat, general groceries etc.) Sets up motive while telling reader more about their life. Supermarkets vary, some have guards, some have music playing, some small, some large... cashiers or electronic checkout, these days in some countries folk would be made to wear corona face condoms and be made to sanitize their hands before entry.
So it all depends on what MC focuses on and how they act: smells teh butchery, leans on trolley, checks fruit for bruises, reads mayo labels, greets a colleague/acquaintance etc.
I'm guessing that supermarkets are quite generic so most readers won't need an in-depth description to know what one looks like, all depends on you in the end.
