A buyer planning to live in one side and rent or use the other themselves usually wants at least that unit delivered vacant, which means ending a tenancy properly under the Act well ahead of your target listing date, not after an offer lands.
The City of Saskatoon's permit status for the second unit also affects the buyer pool. A duplex with a properly permitted secondary suite qualifies for lender financing on the rental income; an unpermitted one narrows your buyers to cash purchasers or those planning renovations, which a $400 to $600 home inspection will usually flag.
Deciding which unit to vacate, if any, should happen before you list, not in reaction to the first offer. Get your hand-reviewed valuation from Joel Dyck.