I thought that answered your question... your wife is already in Canada (as a visitor, she will NOT be LANDED until her CoPR is signed) the only way the baby being born would delay the issue of the visa is if the baby was born OUTSIDE of Canada but since the baby will be born in Canada the baby is Canadian. your kind of confusing alittle, you said you have CoPR but now you said you are awaiting PPR so that is abit confusing, so the day you get the CoPR signed PP stamped whichever saying you are a PR is the day your 3 months starts.
So what is your status in Canada? I am kind of confused about that.... before you said you were in Ontario and now your going to Manitoba, (alot of tax paying people here are going to think you are trying to rip them off after all it is them who pays for the healthcare) if you are going to different provinces to try to find someone to cover the birth those provinces require you to live in that province for 6 months after the baby's birth and if you do not, you will be made to pay them back for the birth.