If you have a package to send, you'll want to head to the post office right away.

Canada Post has issued an advisory with deadlines for priority mail to ensure it would arrive before a potential service disruption:

Expedited Parcel (regional) — June 27.

Expedited Parcel (local) — June 29.

Xpresspost (national and regional) — June 28.

Xpresspost (local) — June 29.

Priority (national, regional and local) — June 29.

A service disruption couldn't legally occur before July 2, according to Canada Post, but with no mail delivery on July 1 the last day to receive mail could be June 30.

It's already too late to send regional mail by Expedited Parcel — the deadline for that was Monday.

Still time to reach an agreement

In the online advisory, Canada Post said labour negotiations continue with the Canadian Union of Postal Workers (CUPW), and are now in the "final stretch."

It said there's still time to reach an agreement, and the advisory was issued as a caution.

"While a labour disruption remains a possibility, we are asking customers to take precautions," it said."

P.E.I. businesses already preparing

Businesses on P.E.I. have told CBC they're already preparing for a service disruption.

Veseys Seeds and Bohemian Findings have both switched to a courier service to ensure their mail-order customers aren't affected.