Had my Oath on Dec 31. They said they would mail the certificate on the same day, Dec 31. Case closed in the online tracker on January 3. Received my certificate today, January 11. My case was in Scarborough office. Thank you everyone for your help and good luck in the citizenship journey!Got my Oath details emailed to me today, December 22. Oath is scheduled for Dec 31, so the email was received a little more than a week before the ceremony.