Stop in for a cup of coffee

Evening guys. Quick question, since the car is technically sold and the money is in my bank. Can I mail out the title and BOS to the person who bought my car or should I wait until its on the trailer and heading down the road? Would there be any reason I would need to hold onto the title while Im in possession of it awaiting the pick up? Part of me says mail the paperwork after its picked up, but Im just not sure..
When I bought the Barracuda the previous owner sent the title UPS or FedEx one of them.
When the check cleared the previous owner provided me the VIN. I called my insurance company and told them the date I wanted coverage to begin. Your buyer might have different requirements.