They own it in a handful of cities: https://www.amazon.com/AmazonFresh
Amazon Fresh used to be quite popular in Seattle a half decade ago, but I barely see their empty containers anymore. I think Amazon saw their volume falling with Amazon Fresh and was threatened by their vendors and wholesalers with higher prices, thus purchasing Whole Foods to attempt to stabilize their cost on goods.
Amazon has been cannibalizing Fresh by including (a smaller selection of) grocery items in Prime Now, which (unlike Fresh, which is a premium upgrade) is included in the base cost of Prime.
For example, you can buy a Philips electric razor through Amazon Prime, but refill cartridges are only available through Amazon Fresh. The result: I made my first online order with Walmart and will probably make many more in the future.