I assume we get our "official" gpa AFTER we've submitted our apps on June 5th and been verified (which takes a few weeks).
Yes, once you create an AMCAS login and receive your AMCAS ID number you can fill out your background information and your educational information and then print out the transcript requests to send to your schools. Meanwhile, you can work on entering your coursework, activities, personal statement, etc. When all of your transcripts have been received by AMCAS (you can check by clicking on "details" on the main page of your application), AND you've finished filling out all of the other information, you can submit and wait to be verified. If you haven't received your MCAT score yet, that's fine too. There's a section to indicate what date you will be taking it, and AMCAS will send the score out to the schools when it comes in.