We planned a date, but I haven't heard from him yet?

I'm supposed to have a date with this guy either tonight or tomorrow night ...he was in and out of the city till this morning so he said that he would msg me to figure out which day or whatever...its Wednesday afternoon and I haven't heard anything from him yet (we made this plan on Sunday)..I can't do anything tonight so I'm hoping he at least messages me sometime today about meeting up. Question is though, if I don't hear from him do I message him to find out if we're still on for tomorrow? I've been looking forward to this date but I really dun wanna look desperate. Thoughts?