they sell ones that mount on iphones too, just in case... Amazon has quite a few kinds.
I cant tell to well from the distance but watch your pistils, when they recede, and checking your trichs to where you want. (TRICHS are what we are worried about) Most breeders I have ran under "rate" flower times, use it as when to start keeping an eye out.
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Leaves fading is not always a sign of ripeness in hydro, you can keep them green the whole life cycle (w/out killing taste if you're moderate)- but that is preference.
Great job seeing it through Edge, the next run will be better.