I believe a president has emergency powers to aid states at the federal level, and can temporarily have nationwide actions such as martial law, but it's limited, til congress can act.Unless there's law passed by Congress I think the states would have the power to do what they want within their own constitutions. I don't know what the President's powers pertain to in dealing with a crisis during a declared emergency.
I believe thats why he used the emergency act to control business output, in case he needs to, fr a very good reason. If employees quit or get sick, or just dont show up, he can mandate a business to do whats needed, and others can be brought in if needed to make sure production flows.
The idea businesses aren't cooperating is a cooked up fallacy, as it keeps their people working and fed, and them making some monies as well, though some have volunteered profit to an extent.