Continuing the journey - tips of some leaves yellowing!

Hello all, continuing with my first grow have reached out for help along the way, thanks for everything to date hoping for some more advice.

Last few days the tips of some leaves are yellowing. Not a lot yet mostly near the top. Only possible thing I could have done would be underwater, but I’m pretty good about checking the soil. Hasn’t been particularly hot compared to earlier in July (I’m in Toronto). Wondering if anyone has any thoughts?
Growing in four 15 gallon grow bags on a rooftop patio with pretty good sun (it’s almost 7 now so they’re in shade).

Heading out of town so timing is just great...
 

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