There isnt that many jobs in a grocery store that need many people. Stocking shelves and cleaning mostly. Once those are automated there will be a lot less jobs.
If the jobs were that easy to automate they would have been automated at the current rate. Min wage going from $18-20 doesn't suddenly make that all-in-one supermarket bot doable. Automating real world jobs is hard and often not viable especially for dynamic work. Even the no-brainier automation like self-checkouts are actually not saving much apparently. (could be false, heard it on a anti-min wage channel).
Each year the cost of the technology goes down. At some point it'll be cheaper than labor and that point will just come earlier if wages are higher.
There is this robot called Marty whose reason for existence I still have to discover. I thought it was a roomba style robot but with a camera for navigation. Turns out it does nothing except make the messes it reports to staff even worse.
According to a Twitter post I can no longer track down, those robots exist primarily to shield stores from lawsuits over spillage.
So it's basically a high-tech equivalent of "CAUTION WET FLOOR"?