What's the DTM?

Judging by the size of your plants I would say they are far from ready. Plus they look overcrowded to me. You can brush some soil away from the shoulder of the radish and check the diameter if you want. Don't have to pull. But I agree with farmerdill that daikon roots will be noticeable above ground when they are ready.

Rodney

I concur with them having at least an inch or 2 above ground when they are ready. I've only grown a tillage Daikon radish called Groundhog and they were only suitable to eat when they were less than 6" long. After that they got woody and bitter.

I'm not sure what's the DTM for these daikons. The seeds were given to me when we visited friends in the Midwest. I'm not even sure if the roots are that great tasting since they were meant a ground cover in the Midwest and not really for eating. The choices are to wait for the roots later or the greens sooner.

The harvest at 50 days! Sweet crunchy taste when parboiled in chicken broth.

I love radishes, especially the spicy ones. Congratulations

I almost hate radishes, but raise thousands of them as cover crops after an August or early harvest.