Looks like they might want to go a little longer. I's soooo hard to put a "hard" date on your harvest. To me they look like they have a lot of room for the calyx's to swell. But, having said that it's a personal preference thing too. After investing 4, 5, or 6 months in a plant, I want to reap the max my plant has to offer. I usually wait until most of the pistils are fully redacted, and the buds look like the pic, ( which I scamed off google images).
Having said that, I realize that other factors beyond the control of the grower can come into play. What ever you decide will be fine, they look close enough to finishing to provide enjoyable buds.