I don't know...but I'd say you're maybe a little less than half way? Maybe 3-4 weeks in? They'll definitely swell up and fill out way more than that, especially in whatever ends up being the last few weeks. You should really write things down, it helps you develope your skills. Do you own a pocket microscope or something that will let you take a slightly better look at things? If not, you've still got ample time to get one - you should.
I'll go with 4 weeks in. They look the same as my outside plants and they started flower about the 1st of Aug. You've got 4-5-6 weeks left to go. I find 10 weeks actual to be where I like my photoperiod hybrids. You'll get one that is done at 8-9 weeks and a few want more if they are sativa leaning. They can run 12-15 weeks and still not show any amber. BNW