But as per IRCC it also says that if we never received a Card even after 6 weeks, we can still submit.SD doesn’t work this way. SD is for when your card is approved and mailed but you never received it. In your case, you will just need to wait.
Use this form if:
- you have waited six weeks longer than the normal processing time and you still have not received your PR card; or
- your PR card was lost, stolen or destroyed but you don’t want to reapply for a new one right now.
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/solemn-declaration-lost-stolen-destroyed-never-received-permanent-resident-card.html
Anyways it doesn't make any harm in submitting i suppose...