Just to answer OP (even it is kind of late now): TSA Prechk @ SFO took nearly 45 minutes @ T2 for whatever reason ! and I never see the PC line -that long !!! and this is at 7am of 1/14/23.

I cross to Terminal A later ( 9am?) and it only queue with 15 pp line so I think that about normal ( as of recent memory).

Clear line is , of course, very short !

And AS 1st-class luggage drop, is also short: kudos to AS