I don't have a current pic of buds but..
I never harvest white pistils.
When they turn red and crinkle in then I check trics.
At that point I know flowering and building has finished.
Also when close to the end she will stop draining her pot.
Another sign flowering is finished.
I know nobody knows what I'm talking about here.
But I'm answering a question.
Flush the pot 3x plain water then feed full strength nutrients to runoff at 6.3.
Until she stops eating then chop
Happy new year Amigo
#VIVOSUN #Love What You Grow
Bill284