Grocery workers near me have masks and plexiglass windows built around checkout. An employee or two is just disinfecting carts all day. They don't allow bringing your own bag like state laws used to encourage. I've been kind of blown away by it.
I really think mask guidelines are just as important to next phases as social distancing was initially.
Hy-Vee here has done all those things except masks. They installed plexiglass, wipe down the belt between customers, etc. But I've only seen one or two employees wearing masks.