There’s a lot to do! I highly recommend reading the RABBIT INFO section of this website so you have the essential background knowledge needed to continue caring for Baylor.
There should always be daily opportunities to get adequate exercise in a large space for as long as possible. It’s great that you are getting an Xpen. If it’s not too stressful and is easy to do, simply offering the free-roam time may be nice, but do not force it — if the rabbit wants to stay inside, let it stay inside.
If the xpen doesn’t come in the next day or so though, I would make a temporary, larger space for the rabbit to get adequate exercise.
Do you have an idea of how long he would spend in the cage per day and how big is it?
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.