I doubt you will find much if any action in the earlier hours. I am open to some action but couldn't get to a poolhall til about 6. I usually play out of emerald billiards
White diamonds opens at 12 on Sunday's, not sure about the other days, 3 or 4 maybe.
Emeralds opens around 4 I believe, the other places I don't even bother to walk thru the doors