That looks as about ready to harvest as its going to without a scope. see if you can get your hands on a magnifying glass, that'll help a little, but my opinion would be your either a week or two away from harvest or just about ready. You gotta decide how you want your bud. if you crop now the THC will be at its full potential. If you wait a little while, your thc will degrade a little bit and the CBD percentage will go up. hope this helps
good luck, happy growing and keep up the good work, that shit looks like some OG FIRE!