Well done cbuts you're nearly there, ur hard work is paying off. don't chop now tho like the other guys said wait for the pistils to start receding into the expanding calyx. You can see you still have long and "alive" looking pistils, this means they're still going.
When contemplating harvest there are a few things you should look out for.
1. Calyx's really push at the end and you will see them fatten up overnight.
2. Pistils will stop sprouting and eventually stop pushing out, they should change colour but this doesn't allwAys happen.
When these two happen it will look like u have huge calyx and small pistol ratio, keep an eye out tho coz either one of these would make it seem like the other has happened. So really u just gotta watch carefully.
Finally u want to be harvesting ur weed when the trichones show a colour ratio that best relates to the high you want, all clear makes for some cerebral heady high weed, all Amber makes for some knockout couch locky weed ( which is what afghans do best), and a mix of clear cloudy and Amber makes for weed that is somewhere in between.
If u want my advice get urself a microscope or jewellers loom and inspect the trichones on a daily basis until you see atleast 25% of them turn cloudy.