The clerk will ask if you have any travel plans in the next 2 weeks. If you say yes and tell them why you need to travel, they should be able to send your certificate via Purolator within a week. They will also instruct you to send the proof of travel and any supporting documentation along with signed oath form after ceremony to expedite the certificate...and yes, you need to cut the PR card, the conversation begins with cutting PR card after verifying your ID's.
I had my oath on a Tuesday and received certificate via Purolator the following Monday from IRCC Niagara Falls office.
just to share my experience from today
(I am Niagara office too)
I was supposed to do my Oath today at 10:15 so I once I was put in 1 on 1 room with a clerk I explained the situation, told him about reason I’m travelling and provided the proof (plane ticket).
he said those are valid reasons to request fast processing of citizenship certificate but he can’t guarantee that I would still get it in time and it’s pretty much a gamble. What’s my decision
So I decided not to gamble and he told me to leave the zoom meeting and that I will be contacted (couldn’t tell when) about rescheduling the ceremony and providing proof to why I didn’t attend the first one.
my ceremony was today April 13th 10:15AM and flight is on May 7th 9PM
I was hoping since I have just over 3 weeks before my flight they would accommodate but unfortunately that wasn’t the case.
I’m a bit disappointed as I heard people would have their certificates sent out urgently for “lesser” reasons like vacations but I guess I’d rather wait few more months than stress out checking my mailbox every day see if it arrived.
good luck to whomever’s on a same boat