It seems that you don't have DM yet.. is your background still in progress?
You need to be physically present in Canada for oath. If they get wind of your being away, they could ask you to return before they schedule oath. In the worst case they could put your application on hold. This was seen in cases of people who took their citizenship test outside Canada. If you're away, you need to maintain your pr residency requirements.
I don't know about new PCC requirements if you're away at any one country for more than 6 months whilst waiting for oath.