Thanks to the Almighty...
Finally, My kid is a PR
...
After receiving the PR Visa and COPR, I was reading about the Border crossing threads. Most of the popular borders were not allowing Landings on weekends. So, I went ahead and spent 40 minutes trying to talk to an IRCC agent. And once I got to talk to one, I asked to put me in an appointment request for inland Landing. She took my address and put in the request. She told me, that I'll get a call back in 3-6 weeks. And then they'll tell me an available date.
When checked, she told me I can still go ahead and do my border cross landing, but let IRCC know after that is dopne, so that they can cancel the appointment.
To my surprise, exactly in one week, I got the call from local IRCC office and said, if I can go to them in 2 days. I was like, "Oh, Yes... At what time?".
We went in there 30 minutes earlier than the scheduled time. Checked in. Asked us to wait. And then another applicant came. They had the slot before us. So, they were called and done in 15 minutes. They the person called us (that was 15 minutes earlier than our scheduled appointment). We went in. It took 10 minutes. Normal questions. Address and finance proofs (they had asked me to bring these for the appointment, when they called). Asked me to sign on my son's behalf. Wished us congrats.
And we were out within 5 minutes.
Went to Service Canada and applied for SIN. (Health card was applied earlier when we got the PR approval letter).
Thanks to all of the folks here.
And all the best for those whose applications are in progress.