Within the city limits....I doubt if any grocery operation has more than 10 days of food to put on the shelf or rear of the store. I doubt if the politicians really grasp that. If you triggered deliveries to be entirely halted...it’d empty out the city in a quick fashion.
10 days a normal rates of consumption maybe. But as soon as word got around that supply would be gone in a day... 2 tops. Just look at what happens to bread, eggs & TP whenever there’s a major snow in the forecast.