Leaf discoloration happens at the end, you can view other people's journals/diaries of the same strain to determine when to harvest if you are lacking magnification. It's what I do, I pick the one that's been left the longest and one that's been harvested early and try to aim in middle. But I would say another 7+ days for sure maybe 10-14. I would try And drop your humidity to avoid mold/bud rot. Also get ready to flush with what ever method you have chosen or is recommended by your nutrient company. My 1 plant is at the same stage with 1 a week ahead and the other 2-3 weeks behind.
*Edit* great job by the way, this is one of my all time favorite strains.
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