Glad to hear its not fractured or broken. If there was swelling it was likely sprained in the fall, but its hard to tell how bad. I really can’t give advice from experience at this point because I had fractured my wrist and the sprain that accompanied it was already healed by the time the bone finally healed.
Like any other sprain, the severity is going to determine your rehabilitation schedule. I would be testing pain free range of motion 3-4 days later and if it wasn’t improving after a week probably go see a PT to get the severity assessed. If it seems good you could likely start restrengthening and improving mobility, but I would be very careful at first.
Sorry I cannot be more specific, but I can really only give anecdotal advice from my own experiences. Good luck and take it easy on returning to judo.