Hit me off with some knowledge of the Calyx stages of maturity, i like this chart I'm saving that one.look good, and yea guess your harvest window is open, and the next 1-2 week`s (longer you wait the more heavy smoke so to speak)
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and yes yellow leaves is normal near the end (just as the nature at fall) tho you can keep em green more or less to the end (some yellow bottom leave`s and colors of the top leaves is still normal) with good results, try not to cut your N completely next run (still cut the nuts near the end and use clean water to "flush" the soil a bit)