The biggest problem is running out of room where the light is good enough. Those don't look too crowded, so you should be able to squeeze in bigger pots, with more compost in the soil. Cut off those yellow leaves, give the stems adequate support when they begin to sprawl - don't let theme be crushed on the rim of the pot.
They should be fine - and you have substantially extended the growing season, which I assume is a major issue in your zone.
