For new investigators submitting applicatons for standard receipt dates (does not include RFAs & PARs with special dates), that is. All the CSR Standing Study Sections are on board with the shorter review cycle program as of the Oct submission, so you don’t need to check & see if your proposal qualifies.
So, for example … you’re a new PI who submits an R01 for the Oct 5 deadline. You get your summary statement no later than March 1 (hopefully earlier). If you’re quick like a bunny, you can submit an amended application by March 20 to count as a March 5 resubmission. Otherwise, you wait until July 5 to resubmit like everyone else.