Many thanks for the quick responses, @Kai G. Llewellyn, @jpfashizzle
Considering that I'm an Indian national (with a US Green card), I've by definition, lost my nationality. However, I believe I need to officially renounce my citizenship to put that into effect and as such I'll be using my Indian passport with the green card to enter Canada (much like @jpfashizzle), My concern is should I claim Canadian citizenship upon entering at the CBSA booth, or just keep it discreet and enter as a US LPR. Ideally, I would have liked to cross at the land border since it seems to be more forgiving, but I'm pressed for time unfortunately
@Kai G. Llewellyn how long did it take for the passport office to issue your passport after your in-person application? Did you expedite the processing to enable the pick-up whilst you were still in Canada? From what I've been reading on forums, it seems it is up to the discretion of the Passport officer to determine if the applicant can pick-up the passport in-person. Most people that had a US address on the application had their passport mailed out (based on forums) - does this hold true?
Many thanks!
NK