Okay! I just opened OsmAnd and looked up my local supermarket. Sadly, no work hours. And this is a very popular supermarket right next to a train station in central Brooklyn, NY.

The thing is that business owners do update the info on Google Maps, and have an incentive to do so, but only volunteers update OSM.

OSM shines where businesses don't care but volunteers do: trails in a park, non-commercial POIs, etc.