The best thing to do is keep a mask handy. Some states are ending the mask mandate for those who are fully vaccinated. However there are some big box stores that require masks in others don't in the same jurisdiction. If the store has a sign posted, masks required, if you want service follow the guidance if you don't people look at you like you have typhoid fever and start yelling at you, maybe even call the police. These kinds of confrontations have occurred before this point in time. Be careful and use common sense.