I bought my truck in May, the dealer in NJ was going to deal with NY DMV by mail. I rode around with a 30-day temp tag for about 90 days until the plates came in the mail. Drove out to Indiana and back with expired tags. Every DMV in every state is dealing with the same issues due to covid.
I see NV DMV issues what they call
Movement Permits and it says that they are available at every DMV location without an appointment. I would go down there and ask for one to use as a temp tag until you can get registered.
USAA had no problem with insurance on the truck because it was going to be registered and titled to me when the paperwork was done.