It's always smokeable but as to how much you may have lost, it really depends on the strain. Some strains develop faster than others but prematurely cutting a plant does derease the potential potency and size but you cannot truly gauge the loss when your yield is your baseline.
Looks like it will be ok to smoke, was that some calyx swelling i could see in the pic. What is the strain flowering time, love the name purple urkle. At one foot is that an autoflowering variety??
yeah man, you need a microscope or magnifier to look at the color of the trichs, you want mostly milky, any amber and its already degrading, and any clear means its not ready yet
done???? umm ive grown P Urkle too dayum many times.... its ready when its purple and the leaves yellow and start to fall off, its not purple urkle if it doesnt turn purple straight up