While the Union did table a new deal (admittedly one they probably knew Canada Post would not accept) to stop a potential work stoppage yesterday, it looks like we will see a disruption in the mail as early as Friday.
Canada Post Corporation has issued 72 hour notice of a lockout. While this does not guarantee mail disruption, both sides can still negotiate, it is likely that we will have no mail starting on Friday morning. So you may want to double check how companies are mailing items if ordering online and pick up any parcels waiting for you at Canada Post locations.
Both sides have said their latest offers are final so it could be some time before they come to agreement, especially with the government wary of getting involved after the last back to work legislation was found unconstitutional.
They did come to an agreement that there would be up to two days delivery per month to ensure that pension and government assistance was delivered, but this does not include many government payments so you may want to check to see if you will receive payments on time should the lockout go ahead this week.