Probate confirms the will and the executor's authority, and the grant is what Information Services Corporation requires before title can transfer to a buyer at possession. In Saskatchewan, a straightforward application typically moves in a matter of weeks once the paperwork is complete, and takes considerably longer if the estate is contested or the assets are complicated.
You can list and market the property, and even accept an offer, while the grant is still in process, but the purchase agreement needs a condition tied to obtaining probate, and the buyer's lawyer will want proof of the grant before removing conditions and advancing funds through the lawyer handling the file.
The Canada Revenue Agency treats the date of death as a deemed disposition at fair market value, so a documented valuation from around that date matters for the estate's tax return as well as for pricing the eventual sale. Joel Dyck's hand-reviewed valuation supports both, prepared while probate is still moving.