general rule of thumb is any secondary not out within the first month is late. Yes, you will hear tales of folks who applied late and got interviews, and you'll hear tales of folks who applied late and didn't. Bottom line, if you're a great applicant you can get interviews no matter when you submit but your chances of getting an interview and acceptance are, without a doubt, MUCH better if you submit early. And by early, I mean AACOMAS within the first two weeks it is open and secondary turnaround in no more than 7 days.
So, yes, you are applying late. Is it the end of the world? no. Can you get an interview/acceptance? yes. Are your chances better if you had applied early? Of course early is better.