At this point, you are already committed. They should dry ok if they are mature. Use the immature ones for the southern delicacy boiled peanuts. Maturity is really the only issue. Field harvested peanuts, leave the vines in the field. Most of the dirt will come off in drying but you can wash them upon harvesting. best done before drying. https://www.gardeningknowhow.com/edible/vegetables/peanuts/harvesting-peanuts-in-gardens.htm https://www.nationalpeanutboard.org/peanut-info/how-peanuts-grow.htm

Note the both commercial And traditional way is to dig and windrow the plants like hay. the pick the peanuts from the dry vine either by hand or using a combine.

Today I only grow a small amount of peanuts primarily to test varieties or for my own amusement. I wait until the soil is relatively dry, dig, and strip the vines immediately, the spread the out in a shed to dry. Reason. Birds! Crows and Blue Jays will strip a small planting before they dry. Growers will use carbide cannons and other devices to chase them away. Not a good idea if you have close neighbors.

Thank you farmerdill. For future reference, does leaving them attached to the plant while drying serve any purpose, such as continuing their growth? I detached all peanuts from the plants and spread them in a single layer to dry inside. I only grew a few since it was a first-time experiment.

Maybe those who are 90% mature may get enough sustenance from the vine to mature. The major purpose for drying them on the vine is ease of harvest. Same principle is used in harvesting dry beans