Yes, they sound ready, Bob. Harvest them carefully by loosening underneath them with a fork and lifting carefully; gently brush most of the soil off and lay them out in the sun (!) to dry out. I spread them out, not touching each other, on a home-made chicken wire tray or one of those slatted wooden boxes, so that the air can circulate round them and quicken the drying process. The rest of the soil can be rubbed off when it is dry.
Enjoy!