About right for this time of year I'd say.
Engineers have still been able to work during the Lockdown, and they've had a full closed season. If they were working on an optimistic schedule if being open to open in late March like normal, it would be around now that they would need to get rides staff in for training, etc., and so engineers would be doing their final tests.
Noteworthy that Rush still has its top off. When it received major work in the past, it hasn't opened at the start of season. At the moment, I still don't expect it to be able to open on April 12th tbh.