[aquila48]

“And I want to be correct when I tell these grocery store managers that there is no such order or law.”

Then you better check more than what the state says. Some localities have implemented their own rules that require you to wear a mask.

See this for example...

https://www.hubcityspokes.com/news-hattiesburg/hattiesburg-residents-be-required-wear-masks-while-shopping

So has the town where you live implemented a similar edict?

[Yosemitest]

City Mayors have similar powers as the Governor over their city limits.

DEMOCRAT Mayor James A. Young of Philadelphia Mississippi, on Apr 28, 2020, "issued an executive order that requires people to wear protective face masks while inside any city business."