Latewood might have skimmed the question quickly and did not notice you apparently have been giving them nothing but pH water for over 5 weeks, and this is 5 weeks past the expected finishing time of about 9 weeks for gold leaf***.
I would have to say the parts of the plant that are dry are dead and finished, smoke it, tell us how it is. They might not live up to their full potential as they’ve been in the light for so long after they have stopped all biological function and some of the THC might be a little more degraded. But I’d imagine it should still be pretty good smoke.
Check out this link, if you haven’t already done so, for more tips on telling when your plant is finished, even if you can’t really see a lot of amber trichomes: Flowering time period
Oh, yeah…and for the rest of it, yes, cut it down right away.