Probably nothing, but it provides a way for the government to answer the question "when are we going to open back up?" to being "when all the checkmarks are green" instead of "when we say so".
Then if you disagree with the government's position, you can base an objection on facts (e.g., one of these metrics is not set at an appropriate level or is not impactful enough to guide decision making) instead of just yelling that the government is wrong and should change what they are doing.
A lot of people screaming about reopening don't even seem to realize there are criteria and metrics involved, rather that it's just some arbitrary decision arbitrarily made by governors, which is why their whining is so useless. I'd be much more open to hearing people's reopen arguments if they came in the form of, "we don't need to care about this metric, because <blah> and this other metric can be lower, and this whole stage of the process doesn't need to exist, therefore we can think about reopening earlier." Instead you get neckbeards with AR-15s and Confederate flags (in Canadian border states!) screaming at public servants about...something. I don't know. They're mad and they want something to change but they have no ideas and they don't know how to communicate with people.