Standing does not require actual harm, but you can support standing by showing imminent harm - e.g. you will be fired if you do not subscribe to the complained of government mandate. You don't have to commit a crime or offense to complain of an act that makes and action illegal, but merely show that the government has invaded a specific right that you have.
My point is that I read of people quitting in fear, slinking away, rather than standing up for themselves. It is a lot cheaper and easier for companies when people quit as opposed to being fired. And if they are near retirement, bet it is harder to claim or reclaim benefits when you voluntarily quit. If in the situation of these people, I’d want to make it as painful and expensive as possible for them to fire me. I’d sue for wrongful termination (never heard of anyone suing for wrongful quitting).