Well, what week would you say your on first off?
And also I would look up that particular strains flowering time, a few of em preferably, from different sources would be best.
Don't go by what you find.
But it should give you a bit of knowledge so where as you could just find the average.
So that will give you a ball park, say 10 weeks minimum, I would do my last feed on week ten and then feed only plain water, or a flush mix of you choice.
A loop would help.
Or take a very good quality close up photo, and then zoom in on your trics and see how they are looking.
Clear/Milky/cloudy/amber/
Something like so. But you can get better photos, steady hand, steady shutter button click. And manual focus helps.
You need a loop. They aren't much on Amazon if you shop from them