Restaurants and bars are closed until the end of the month but the slopes are still open. It is actually a really great time to go skiing here. The sun shines and you share the slopes with just a handful of others. In Chalet Tannegg you can use your fully equipped kitchen to cook at home, unlike the typical hotel room.
Read here all the COVID-19 measures on the Saas Fee tourism website: https://www.saas-fee.ch/en/coronavirus