Your I-129F petition was only approved in February. Montreal is very backlogged for interviews, it could take many months before yours is even scheduled. Even after you get an interview scheduled, there is no guarantee that the K-1 visa will be approved, and if it is, no set timeline for how long after the interview it will take to get your passport back with the issued visa in it. Some in your situation have even seen Canada Post lose the passport. As for wedding planning, it is impossible to predict exactly when you will have the K-1 visa, so you should be flexible and not commit to any specific date for the wedding. We have seen other couples here on VJ who made wedding plans, sent out invitations, spent money on expensive, non-refundable deposits for venues, etc. and then saw K-1 visa delays and had to change everything. On rare occasions, a K-1 visa holder is denied entry at the US entry point. Hopefully, none of those delays will affect your case, but they could. The US Dept. of State clearly warns visa applicants: "Please do not make firm travel plans, such as buying a ticket or scheduling events, until you have your visa and IV packet in hand."
https://ca.usembassy.gov/visas/fiancee/visa-approval/