Hi L,
Most school's second rounds deadline is in late-Dec / early-Jan, so you do have time to apply if you are interested. I would encourage you to start the process as soon as possible, as MBA applications do take time.
You might consider picking up an MBA admission book. I am a big fan of the Admissions books - they give you a great overview of the admissions process and top MBA programs. My favorites are: How to Get Into Top MBA Programs by Richard Montauk; and Your MBA Game Plan by Bouknight and Shurm (full disclosure - I work with Veritas Prep, which is affiliated with the book)
Good luck!
NP
Nikhil P. | Admissions Consultant | Veritas Prep