I confirmed this as well. We just PIF but are on the fence about using DCL Transfers back to MCO. Our Costco TA said we could call them to add it later, he recommended about 2 weeks out at the latest although from previous posts you may have even more time.
When I ultimately do book the Disney bus, will I get to choose a time on the day of? Because I'll be flying into Orlando the day before and staying at a hotel, then the next morning I'd like to catch the earliest possible Disney bus to Port Canaveral. And then same thing on the way back. I'd like to catch the earliest bus back to MCO if possible. So how do times work?