PreCheck now up and running at Terminal 3.

These are the hours listed on the TSA site:
Delta Air Lines: Terminal 3, North Checkpoint:
6:00 AM - 9:00 AM; 12:00 PM - 3:00 PM

I went through at 10 PM 10/28 and it was open.
Tonight at 6 PM it was not. I was given a card to hand to the screener so
I didn't have to take my shoes off but computer and liquids had to come out.

I asked about their hours. He said they are open for the early morning flights and late night flights. That they are basically closed from 1 PM - 7 PM.