Feldon some days you really make me chuckle!
It'll be an experiment for you Dingbat. In my lowly zone the first blooms fruit of Dr. Carolyn ripened about the same time those of mid to late varieties did (all seeds were started late but at the same time.....Black Cherry however germinated 3 weeks after all the others). I'm not sure if the 90's/low hundred with high humidity we had slowed down Dr. Carolyn/Black Cherry/etc or not but just before freeze-up I was eating just ripened fruit from early-mid to late season varieties(?!?!?) The only ones that ripened early (and kept producing here) were Silvery Fir Tree, Sun Gold and Stupice and a purchased, very early started, Delicious.
If you're from Toronto maybe you'll be lucky enough to get them in the ground early (and have blooms) before the humidity really moves in.