Referral for Diagnosis confirmation

I was referred by my GP in October for autism assessment and the service sent an email that my details will be reviewed to see if I meet the criteria before confirming my assessment and not to email them beforehand. All this before I’m put on the waiting list.

It’s been two months now. I’m fine to wait but I just want to confirm if this is normal protocol to wait for confirmation of me referral or if I need to escalate…