It is hardly a surprise. I've had four going on all together, and the last is still pending. But eventually, they sent them over. Sometimes it sounds like a lottery, but so far they've managed to sent what I've ordered in more or less twice the planned time. Luckily everything was fine. A lot encountered issues with the Formula brakes, likely due to labelling issues that ended up with sending the wrong items to the wrong customers.
Most of the wheels are sold as sets, so that might help ruling out such an issue.
As usual with RCZ: wait and cross the fingers, after two months you might be close to have them sent to you.
Check the email and the spam folder, for they sometimes update the status on the portal just when the item has been received, but at least here in Italy some courrier barely notify by email the attempted deliveries, and than hold the item back in storage, so if you are not aware of that you risk to have the item sent back to the vendor without even knowing it.