I'd say submitting secondaries now is average to getting close to late; in speaking with LOTS of schools last year and this spring, I found that in general submitting a secondary through end of August, schools did not consider a secondary remotely late. Sept, and you're pushing it a little, one school said 1/2 of all apps were generally received by 10/1. October is not outside the reasonable realm, Nov is pushing it, December and you've got very little chance regardless of the posted school cutoffs for secondaries being submitted.