This has been a nightmare for me with locations I'm managing in Manhattan. I marked all these locations as temporarily closed but most of them come back as permanently closed after a few days. I just did another round to reopen and mark as temporarily closed. I'm not sure if they will stick.
Yelp is miles ahead of GMB on this, they added an option to add a COVID-19 message and they have a clear and easy process on temporary closures. I would hope Google would get their act together on this as it's frustrating and hurting clients who are already reeling.