...have been doing what's described for 9 months.
I live near the warehouse center of the Midwest, then there's a refinery, a few chemical plants, a couple plastics plants, an food grade oils plant (their biggest product is an all-natural butter flavored corn oil), and a pharma plant that makes vitamins and antibiotics.
I know somebody who works in almost all of them and they all wear masks if not eating, lunch times are staggered so distance can be kept in that room.
A couple had unfixable issues, like a control room with 3 people where it isn't possible to stay 6' apart all the time. Thankfully that hasn't been a spoiler because none of them had had outbreaks.
So, they're doing something effective, and these OSHA guidelines read a lot like what they've done.
Of course, that won't apply to every workplace.