That plant looks done in my honest opinion, you look for the fattening of the bracts, Once they stop swelling you are close to done. But the best way to know is with a microscope, you study the trichomes. If you want a body high look for alot of amber, you want a nice head high look for all milky. Clear trichomes are immature. I typically go for a nice mix of milky/amber 60/40% either way.