I thought he tweeted yesterday that he was doing it at 4pm, which would make it 7pm here. But I could easily be mistaken.
If he was announcing at 4 california time, it would be 6 here.
If he was announcing at 4 our time, it would have been at 2 cali time.
Edit: Turns out he's announcing at 7 in Arizona. So that will be 9 o'clock CST.
Don't wait up though, this looks far from promising.
AZ is on MST so 8p CST. He sadly is going to say UCLA.