From the current year onward there hasn't been any streamlined IP1 or IP2.
When you get AoR you first get biometric request after your medicals pass. Then you might get one or two ghost updates or nothing at all before receiving your PPR email.
During this time what they do is Eligibility Check, Security Screening and Criminality Check. But no one know for sure which is being done first or if all things are in parallel. All we can do after bio metrics is wait for the process to complete