Ah! Another non-weed-smoker! Happy to make your acquaintance! I grow only because I like growing things and weed is particularly challenging!
What you are seeing are little kind of bubbles called trichomes.. they are the thing that gives the smokers their high... in them reside all the THC and they are literally the GOLD of weed. They're also very important too watch as the plant matures. First of all, you'll need to see the pistils (the little white hairs) start to turn brown... Then, you'll need to get a jeweler's loupe to get a real close look at the "trichs" - or failing that, just take as close a picture of them as you can and then zoom in on that photo... you'll be able to see their structure. They'll look a little bit like mushrooms and the color of the round part on top is the key thing to look at. At first, they won't have any color and will essentially be clear. Later on, they'll start turning a milky white - and then a little while later, some of those milky white ones will start turning amber... THIS is the time you want to harvest your plant...
You've got a ways to go yet but you're doing a magnificent job!
Good luck!!