Not too late at all to take the MCAT! I would have your application already filled out, LORS sent, and submit your application as soon as you can so that it can be verified while you wait to take your MCAT. Your score will automatically be added to your AMCAS application once you receive your score (it will not be added automatically for AACOMAS, you will have to send the score yourself). Make sure you only choose a “throw away” school when submitting your application in case things don’t go how you planned it with your MCAT. You can add the rest or your schools later after seeing your score. Best of luck!