I went through security at DCA around 8 am on Friday 1/4 and again at CVG around 9:30 am on Sunday 1/6.
At DCA, there was no line at either CLEAR or the TSA pre-check BP checker at the entrance serving the Delta and United gates. There was one person ahead of me at the belt and magnetometer.
At CVG on the flip-flop, I was the only one at the pre-check BP scanner and was the only person in line to go through the actual screening process. I wish all my adventures at TSA security theater were this easy.