Sadly, if your number is not in place, your listing will likely be shut down tomorrow or the next day and I suspect Airbnb will cancel any future reservations.
I would suggest changing your listing to 32 nights or more to take it out of the short term category until you get your CITG number.
This is the message that was sent to all hosts affected.
"Get a registration number today
Hosts in Quebec are required to obtain a registration number to operate short-term rentals. All short-term rental listings without a registration number on Airbnb will be deactivated on Tuesday, March 28th. To continue hosting short-term stays, you must apply for a registration number and submit it on your listing page.
Update your registration information
Listings that only host long-term stays (31+ days) aren’t required to register. You can make this switch in your availability settings."
I wish you all the best.