A realistic cash closing in Saskatoon still normally takes a couple of weeks rather than days, because the lawyer's title search and the property condition disclosure review, and for a condo the estoppel certificate, all take real time to complete properly, cash or not.
What proof of funds does remove is financing risk: no lender appraisal that could come in low, no mortgage approval that could fall through late, and no financing condition to negotiate around. That is a genuine advantage, just not the same thing as an instant closing.
A serious cash offer with proof of funds is still worth more to a seller than a financed one, just not because it happens overnight. Get your hand-reviewed valuation from Joel Dyck.