Getting the suite permitted after the fact is possible if it can meet code, covering egress windows, ceiling height and fire separation, but the City of Saskatoon inspects for those items regardless of when the work happened, not on some faster forgiveness track.
You can also sell it as-is and disclose the unpermitted status, which is the honest path and avoids a buyer's home inspection, typically $400 to $600, turning up a surprise that kills the deal at conditions.
Either way, the suite's value to a buyer depends entirely on whether it can be made legal, not on how nicely it is finished. Get your hand-reviewed valuation from Joel Dyck.