You'll probably need investors when you need the money to scale (more servers, employees etc). Or when investor money will get you significant growth (even when you don't need the money).
My personal opinion is that you start looking for investors a month (how however long you think will take for you to get the money) before you deploying it to the rest of the grocery stores. This will ensure that you won't run into shortages of money when you are scaling up.
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You'll probably need investors when you need the money to scale (more servers, employees etc). Or when investor money will get you significant growth (even when you don't need the money). My personal opinion is that you start looking for investors a month (how however long you think will take for you to get the money) before you deploying it to the rest of the grocery stores. This will ensure that you won't run into shortages of money when you are scaling up.