Congrats!
Don't do it at Toronto BLS. Go for Brampton BLS instead. I've heard reports that Toronto BLS doesn't allow you to apply for OCI + Surrender together (
@vishalv had this experience) and they collect your original COPR.
None of this happens at Brampton BLS. No BS. You can submit both applications together and no original document will be collected (except for Indian passport for surrender).
I did apply for Nexus and my application has been conditionally approved. But the enrollment centers haven't reopened yet so can't book appointments. I have until October 2023 to book an appointment and get the card so I have plenty of time and I am not in a hurry.