My inlaws citizenship certificate came within a week after the oath i.e Dec/29, 2021 and then they applied for their passport end of Jan and it came within a week too.My in laws citizenship oath is completed on Dec. 29. It was about an hour long. They said, the citizenship certificate will be received within 2 to 4 weeks.
Everything went well. Thanks all for your help in this matter.
The whole process took 17 month, although the they received the application in Aug/2020 but they started processing/open their file in Dec, 2020 so technically it took about 1 year. Thanks everyone who helped in this forum. Good luck!