@the nona, we'll chime in here to say that the bschools look at the AWA in combination with other factors (for example, the actual essays themselves). In general, EssaySnark feels a candidate should be comfortable with any AWA score at 5.0 or above. A 4.5 score is a little lower than we'd like, but it's not out of range. If it's at 4.0 or lower then we start to get concerned, but still, the schools look at everything together, and we rarely see the AWA take on prime importance in the overall evaluation. It matters, but it's not the most important element.
In terms of your score report question: Many schools allow candidates to use their unofficial (test day) scores when they first submit an app, and then send in the official report as soon as it's received - even sometimes after the school's deadline. Some other schools don't even require the official scores until you've been admitted.
If you want to share which school you're applying to, we can possibly offer more guidance, or as Rebecca suggested, contact them directly - these are always good questions to go straight to the admissions office on.
No matter what, good luck on your GMAT!
EssaySnark