Your parents are going to have to travel at a certain point before a vaccine is created. Whether they can delay for a few months will be up to CIC. Think you need to come to terms with the idea that they will have to travel. Luckily they are still relatively young versus other parents. As others have pointed out your parents would need to remain in the US for 14 days to be able to enter Canada that way. Extensions seem to only be granted once COPRs are expired.Me and my wife have approved sponsorship in parents and grandparent visa, suppose to land on June 12, 2020, have submit our position of not able to travel on webform, they say they will review our case and let us know if they can extend because we are 68 and 65 years and no good to travel in this circumstances, second question our destinaton is Vancouver, is it possible we can enter through border from seattle instead fly to vancouver ? please suggest.