As with previous flower. I wouldn't feed any more, you will always mostly have white hairs on tops...tops is where new growth comes from also new hairs.
If You have good yellowing of leaves like one above, its doing fine.
lowering temps in flower room will help ripen, unless you have more plants that are farther behind....then don't.
she will leach any available nutes left in older leaves. and the buds should swell some, you can tell by watch the hairs. they will look shorter than normal, that means bracts are swelling.
Now depending on what kinda high you want from her... stoney or racey?
The norm is there is usually about a week peak for harvesting. pick early...racey. pick later...stoney
Imo picking early doesn't let the plant fully ripen, that means all trichs, terpines and other compounds havn't peaked.
So I always go by..If it looks ready. go another week... then cut
As with the one above...looks a week or 2 away also, pic shows good even yellowing of large leaves, unless pic color is misleading. just plain watter...if you add any nutes at this time, you could trigger new growth and it will harder to flush.