Wild? Plum Trees - I think

New here. We are in Central Va and moved not long ago. Walking the dog I find these along a fence - quite thick. Are these plums and edible when ripe? I think I have images attached. Thank you!

Welcome to permies Luca Dicecco.   Most likely the plums will be edible but you will have to sample them for desirability.
You did a good job of attaching  the photos .  It is not always obvious to new posters that attachment means photos.  Note that there is a space to write a caption or description for each file. Tis is strongly encouraged so the images are more searchable.