I'd say a minimum of 3 weeks. Being your first grow you should be focused on two things: not chopping early and not drying too fast.
Some of the biggest swells come in the last week of flower. Let the hairs brown off and recede into the bud, then the calyx will swell.
It looks like you have only had about one phase of swelling. You should have at least 2-3 phases before being ready. Believe me when I say you won't be able to wait too long.
Then cut the whole plant at the base and hang dry without trimming anything. This will ensure that it drys SLOWLY. As long as you don't invite mold, the slower the better. Enjoy the waiting game. 3 more weeks growing plus another 2 weeks of drying before you can smoke some.