Beautiful plants, but definitely too small pots. I'd try to move at least half the plants outside, both for more root room, and for more sun. Pot up the other plants and leave in the greenhouse, to prolong your harvest if it gets cold early.
I'm from BC, and used to grow short season varieties, so that they would bear starting in June, and finish before the sun got too weak. Even if there isn't frost until October, the sun gets so wimpy by then that the tomatoes ripening really don't taste that great. More sun = more sugars. So take advantage of those long days and that strong sun as best you can!
