I go, as I have throughout the last year, to my nearest Sainsbury store every Monday morning, arriving soon after 9.00 am. They always have someone out front of the entrance counting how many people go in and ensuring everyone wears masks. Inside the entrance there is both hand gel and spray for the baskets. It has got less and less busy as the weeks have gone by. I assume that so many people are now getting on-line deliveries. I use my shopping list and the zapper - items direct into my own shopping bags. Usually have most aisles to myself. I really do not feel at any danger at all there.
The zappers are wiped down by staff before they are returned to front of store for future use. The smartshop tills are all divided by perspex screens and with plenty of room. Within less than an hour I am back at home able to put away my shopping (having first washed my hands).
If there is any specific danger in supermarkets (& I have not seen any such figures), then it is to the staff members who are there for so many hours at the time, not to shoppers.
For those who want to believe all sorts of conspiracy theories and lab made virus, perhaps they should reading the internet so much.
In my Opinion, the greater majority of the public are trying really hard to obey the ever-changing and conflicting rules. But do feel that we are being led by populist clowns.