Not sure if Oak Ridge is similar to Hanford in this regard. But if it is, it will take a bit longer. When I requested my records from Hanford, it took about 3 months as it was routed through a Freedom of Information Act request.
Good idea to have the information and while most places still ask for it, I don't believe these days that it is required to start. They should work off an estimate. The biggest concern is current calendar year.