How long until Federal CG's open after shutdown ends ?

We called the rec.gov number. Had reservations Sunday thru Tues - will have to wait for approvals on refunds. They still don't know when the parks will re-open. She said to just keep watching the web site. It will be first come, first served when they open. Hate to drive all that way and then not be able to get in. Decisions, decisions.....