As for waivers, READ IT!
If it's the general "I understand that I can contract COVID from officiating and agree not to sue the school." Then you're fine. But if the school is forcing the COVID liability on you in the waiver, be sure to line out parts you don't agree with and initial it and have someone from the school initial it, preferably the AD. That will be a legal amendment to the waiver, they get most of what they want and you protect yourself a little bit and we get to officiate the game.
Make it clear in the waiver (I would write this in or bring an addendum with you) that you are not responsible to police social distancing, mask wearing, and any other COVID precautions.