I sent a PM, and feel this would be beneficial to all.
No, I made a mistake. You can submit Amcas WITHOUT your MCAT score. What I meant was that even if you have your MCAT score and submit Amcas on say June 5, and lets assume you're verified in a couple days, June 7, then Amcas won't forward your app to medical schools until after June 21st or around there. Consequently, those of you take it May 22, will get your scores on June 23rd. If you're already verified then there is no difference between you guys and those who had their MCAT score when they submitted in early June
So, if you can, submit before you get your MCAT score. Like say some submits on the first day June 5 and is verified that day. Lets say they have their MCAT score. Let's say you submit and get verified as well. Amcas won't forward both your applications until June 21st or thereabouts to schools. Consequently, on the 23rd they will automatically update your MCAT score and schools will have them. In fact, it's well believed that AAMC get's your score a couple days earlier. So you're even better off.