Is it 730 days or 3 years??The visa officer will have no reason to deny you a PRTD because you will still be able to meet the 730 day residency obligation within 5 years of becoming a PR.
However, if you have your PR card mailed to you, you won't need a PRTD in the first place unless you need to return to Canada before receiving your PR card.
In my opinion, you have nothing to worry about.