shopping – How can we calculate the percentage of products translated into English before traveling?

How can one approximate, before traveling, the percentage of products in local stores in a given region (for example, a city) with an English translation?

When I visit a new non-English speaking location, I often wonder how difficult it will be to buy and take a lot of time. Knowing the approximate percentage of products with an English translation in local stores would help to find a good compromise. between the local purchase and a heavy suitcase.