The pistils will start to turn amber to dark brown in color. The pistils will also start to recede into the flower.
Now its time to monitor the trichomes daily. 
Do you have a pic of the whole plant?
But yeah, you’ll have to learn about trichomes and how to read them. It’s pretty simple and all you need is a hand held microscope or jewelers loop. $10-20
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Thank you all for the advice
It’s very hard to tell but it she appears to have more time to fatten up. A huge mistake that new growers will go thru, is harvesting to early. You rarely hear of anyone say, damn, I let her flower to long…
Thank you