Start lifting the pots to feel how light they are. If the lightness surprises you, it's time to water.
Feed at half strenght starting at 5 nodes. Work up gradually, backing off if you see tip burn.
You don't have to water to runoff every time- only once in a while, and when you are checking soil pH or flushing.
You should read the first link in my siggy for a lot more useful info.

Your outdoor plants look great, nice work. Next year, you might give them a BIT more ferts mixed into the soil- like some bat guano and just a BIT of seabird guano- so that you see yellowing about 2-4 weeks later than you are seeing it now. But it ain't really broke, man :jointsmile: