I'll share my own experience to give an idea of what the timeline is like for a CFI.

Mid-August interview; 3 weeks later captain review passed; 2 weeks later ATP-CTP and later invited to 11/2 orientation; less than a week from orientation a number of us were removed "indefinetly" due to class shirnkage; Mid-November invited to 12/14 orientation.

Some of the folks at atp-ctp were moved from the october orientation to the november 2nd date last minute just like I was. Since it looks like the priority is to the DECs, I would recommend any low time FOs to hold onto your jobs until the very last minute!