When the garlic starts to send up the flower scapes, cut them off before they bloom so the energy doesn't go away from bulb formation and into the flowering activity. And when the plants start to turn brown, the ends of the leaves start turning first, any time after that you can start harvesting your garlic. I don't think you'll have to wait till next fall if you planted them last fall.
I pushed a couple of more newspaper squares of mulched area along the weeded pathway around my keyhole garden. I also finished the laundry, it's down and folded. I decided to dig today and I'll mow and trim tomorrow. Great dinner, healthy, and early to bed.