From the research I've done, no banana plant will give you fruit in 1 season in zone 6a.... The best you can do is maybe get a late pup and keep it alive in the winter hoping it will give you early flower and eventually fruit by fall. I just bought a dwarf Cavendish... it had the main plant and a few pups. I dug up the pups and 3 weeks later it already has 2 more pups coming in. Your other option is to keep the original mother plant alive during Winter... but this size will make it harder and it might not flower because of reduced light.... Honestly, if you have the space, I'd keep the mother indoors without trimming and try to get the latest pup available.... If you can get a pup in July or August, it'll be somewhat small when you bring it in for the Winter and easier to manage before it goes back out for the Summer next year and by that time.... it'll probably be 4-6ft and close to flowering.... and with a whole Summer, you might get fruit... That's what I'm going to do, keep the mother plant and the last pup that grows.

Depending on your care of the plant. It can take up to 4 or 5 years in containers. I too would recommend growing indoors when you can't outside anymore due to the very short growing season in lower zones. Bananas like vente cohol would be the shortest cycle that I know of. Ither then that it's just tall varieties and dwarf varieties.