I am not sure if it is helpful. But, I saw folks who took oath on Nov 15th getting their certificate. Link below.
https://www.canadavisa.com/canada-i...p-certificate-after-oath.735545/post-10288932
It all depends where they are located and where they took oath and where is their processing office. If all three under same office, you should get certificate in 1 week or else it takes time (2-3 weeks).