Always let your PLANT tell you when it's ready for harvest! Not some website! She looks like she's almost ready... leaves are yellowing nicely ... but you've still got a bit of green going on so it won't hurt to wait another week or so for the buds to fatten up a little more. If you have some kind of magnifier and can get a close look at the tricomes, that will better inform your decision... they should be starting to turn amber... The only thing you hurt when you harvest "late" is a LITTLE bit of THC... not enough to make a big difference...
Good luck!