1. Submit the request in webform stating that its risky for you and your family's life if you travel in the next few months while there is no cure/treatment methods are available. Tell that you would like the extension of 1 year(just ask without hesitation as its the truth anyway - they may give 3 or 6 months or reject).
https://www.canada.ca/en/immigratio...9/immigration-applicants.html#approved-before
2. Dont travel in May.
if you really want to travel then travel in June. But wait for the word from cic. If you are close to border then travel via road rather than hitting airports.
Frankly, you should decide if this travel is worth the risk. Cure/Treatment only after months during fall/winter and vaccines after a year hence situation is not good. Hopefully the cic gives extension. But not sure why you are still waiting to apply for extension from cic. Just ask today and tell clearly that its danger for life and you really really need extension for this year end or for 1 year. First apply for extension rather than planning to land. Landing is a simple job.
No one knows if cic will give you extension. So no idea how others can suggest at this situation. Its your call whats is worth and priority for you.