Any idea when to expect iPhone 12 Pro Max in stores?

Went to an Xfinity store on launch day to try and get an iPhone 12 Pro Max. That store did not receive a single Max. Found another store, which only received one and a customer was trying to decide to get it or not.  He got it. It's ridiculous to not have a telephone number to call any stores to check stock, physically have to go into a store during a pandemic in order to trade-in your current device (not allowing you to order online, as new customers can) Any idea when Xfinity Mobile stores will have 12 Pro Max in stock?