Here's an interesting anecdote: I placed two orders with Perfect Circuit over the last two weeks, both of similar size and with the free shipping option from California to Ohio. One was shipped FedEx on October 29, the other was shipped USPS on November 3. Both are scheduled for delivery today (November 5).
I guess the moral of the story is that shipping is unpredictable at best since the pandemic began, and everything will eventually find its way to you regardless of the carrier.