Not all blue chips find out early. Any LOAs given out are conditional upon completion of application (the application is no shorter for an athlete) and as we all know by the time you do DODMERB remedials and nomination paperwork (yes coaches tell you to apply for all nomination sources still) it can take some time.
As far as SATs, I would target as high as possible. They provide an average for previous classes, I would always make that the goal. The reality is no one can answer this question as things such as what sport, how bad they want you, what were your grades and classes in high school?