I think a lot of people have probably submitted their secondaries already. However, not all of them will be reviewed right away. There are many that will take the MCAT in August and whose applications won't be reviewed until October (when their scores are released). There are probably an equal amount of people who have yet to send their secondaries in as well.
My suggestion would be to sit down and start filling them out. None of them take all that long. Also, have all your LOR's sent to the schools you plan to apply to. The sooner you have a completed file, the sooner you will get an interview, and the sooner you will receive your acceptance.
Good luck!