There's no word on whether any progress is being made in talks between Canada Post and its largest union that could avert a postal strike on Monday.

The Canadian Union of Postal Workers served a 72-hour strike notice on Thursday night, so will be in a legal position to start job action Monday morning.

The two sides are meeting this weekend for talks with a federal mediator, but neither side has provided updates on any progress in the discussions.

Canada Post has said it has no plans to serve a lockout notice on CUP-W, which represents most of its employees, as talks with a mediator continue this weekend.

The Crown corporation had threatened to lock out employees earlier this summer, but has since said it's committed to mediation efforts.

CUP-W has said any job action it might initiate would not involve a full-blown walkout, but be confined to members who refuse to work overtime on a rotating basis.

The two sides have been unable to make progress for months on the issues of pay scales for rural letter carriers as well as proposed changes to pensions for future employees.

Veteran mediator William Kaplan was appointed Friday to try to break the impasse between the two sides.

With reports from The Canadian Press