To the original poster---I did your exact plan this past Friday. We got to MK for the 9 am rope drop. We'd already been to MK a couple times earlier in the week where we got in all our must do rides, so this day was a leisurely day where I didn't feel pressure to get it all done. Anyway, I took my girls over to Tomorrowland. We hit AstroOrbiter first thing, then Buzz, met Buzz outside for pics, to Space to pick up some FP's, rode TeaCups, went to Toontown for the 10 am opening, waited for the Princesses in the Princess room for about 15 minutes, then walked to Main Street Bakery. We were walking in the door at about 10:30. There was still French Toast Loaf then, which dd8 and I shared. It was delicous!
I returned to the bakery the next day, late at night after Spectro at 11 pm, and I can tell you they did NOT have French Toast Loaf then. I've been told it is only a breakfast item and breakfast ends at 11 am.
I hope this info helps you.