how close to harvest?

You are very close and looking good! I would personally wait at least a week more than likely two. You want to at least wait till more hair are orange than white. And even the white ones will quite sticking straight out and kinda start going wonky and curling. That’s about as close as you can get without a scope. You can try and rest your phone on something and zoom in and take a flash picture. Sometimes works depends on phone camera quality though. Happy Growing!