I dont think a big industry or a size of super market is accepted crypto in mass adoption yet. I hope we will see something like this soon and will be using it for real purposes.
The only supermarket I know that's leading is Walt Mart but I don't have any news if they are going to adopt and accept bitcoin. It's going to happen and we'll see it that many supermarkets are going to accept bitcoin. Today they might not consider it as the population of bitcoin is still not that considerable for their business but once we've exploded up to 20%-50% of total world's population for sure there will be a consideration for those big leading supermarket or retailing companies.