As you are a paper applicant you can change the address on ECAS. Two experience that I read-Has anyone changed their address just before oath or during oath?
How did it go?
Did it cause any delays?
Did you have to fill any web forms?
1) During Oath, doc verification the agent verified the address and the applicant said they are not living at that address anymore. Agent updated the address and Citizenship certificate was received on new address.
2) During Oath, doc verification the agent verified the address and the applicant said they are not living at that address anymore. Agent updated the address but said no guarantee Citizenship certificate will be sent on new address. It might go to the old address. Not sure what happened in the end.
In my opinion you should change the address now so that it will reflect by your Oath date. As your oath is confirmed there is no chance for delay.