Anya, although I grow my garlic in the ground and not in pots, I do think yours is at its end stage... I believe the main problem with the bulbs being small is that those plants are much too crowded in the pots. In the ground I leave at least 6 inches in all directions between the plants (and, in my northern climate, still do not harvest huge bulbs, but they're reasonably large).
That said, it wouldn't hurt to wait a little longer to harvest yours; but if you want intact bulbs be sure to pull it out before all the leaves are dead or you will end up with a bunch of individual cloves.
