I just mailed in my renewal today 28 May 2020.
My passport is scheduled to expire October 2021. I had some August travel to Belgium and September travel to France planned. The August conference was just canceled and I'll likely have to reschedule an early France trip that was just for fun anyway right after Labor Day. I figured I would try to renew after those trips, I can't travel anyway for several months, so I thought I'll just renew now. Hopefully that wasn't the wrong decision. They will eventually work through the back log.