Lift one root and see what sort of a crop you get. If they are early potatoes on lift what you need for that or a couple of days eating as thy do not keep well out of the ground. If they are main crop and you are happy with the root you dig up then you can lift them all and leave them on the surface for the skin to toughen up for a few hours then into hessian sacks and store somewhere cool, dry and away from light.

But dig them don't pull them!

Indeed :-)

cheers to ALL