There are indeed many added workplace restrictions, at least in Iowa.
The end of this short article describes some of the steps:
Not really. Here are the CDC Recommendations for meat and poultry plants. Almost none of it is required. The work environments should be configured so that workers are spaced at least six feet apart "if possible". Use physical barriers like curtains or plexiglass between workers "if feasible". Plants "should consider" ensuring adequate ventilation for workers. Other steps to limit employee congregating around things like timeclocks or break rooms "should be considered" or done "if possible".
I don't know if you've ever seen a meat processing plant but the worklines are elbow to elbow, facing another employee across the processing line. That isn't going to change unless they are required to do so because doing so would make plants less efficient and less profitable. And they aren't required to do so.