As best I can tell, this is the broadcasting schedule for all the Memphis stations currently broadcasting digitally.
WPTY (ABC), 24-1, 5pm - ~1am (WB programming 11pm-1am)
WREG (CBS), 28-1, 7pm - 10pm
WLMT(UPN), 31.1, 7pm -
WMC (NBC), 52-2, 5pm - 12am
WHBQ (FOX), 53-1, ????
If you not getting CBS, you're missing out on some of the better HD content available. Most of their prime time lineup is being broadcast in HD. ABC has some HD, but not as much as CBS. UPN and PAX have no HD content, but are both broadcasting all their prime time programming digitally. NBC has been having problems and has just recently in the couple of days gotten back to a regular schedule, so I'm not able to report on them yet. FOX is at low power, and no one is able to pick up their signal.
I'm not sure about the playoff games Saturday. Hopefully, CBS will broadcast the HD feeds, but there's no guarantee.