I will be watching it no matter who wins on Thursday. By Time Zone, you would think that the West regional would be the later game. However if Syracuse and Ohio State are playing, CBS might want to have them on the later game. I looked on CBS and ESPN but they don't have times listed. My guess is that they won't decide until they know who is playing. TV Guide has the first game starting at 3:30PM Central and the Second at 6PM Central.
I just looked ahead on my cable box/DVR and they are listing 4:20 and 6:40 ET for the games. So 3:30-ish CT sounds about right.
They won't decide which game to put on which time until they have the matchups. I'd imagine Michigan State-Marquette would be pretty attractive for prime time, but Syracuse-Ohio State would be sweet, too.