I wouldn't be completely shocked if he got it today, but that is very dependent on a lot of things.. the major things that I could see delaying it more than getting it say by.. tomorrow or Friday morning would be that they are going through a major re-certification period right this moment... the other thing is that even if he took the test at 8 AM where he is located, that might be noon in Columbus, OH, where the NREMT is located, depending on his time zone. I wouldn't think that would be early enough for same day results.
That said, don't stress, take a bath, relax... if you passed, you passed.. if you didn't, nothing you can do to change it between now and when you find out. Worry about it when you get your pass/fail notification.