There is no capital gains exemption quirk unique to a rental in Saskatchewan beyond the standard Canada Revenue Agency treatment of a property that was not your principal residence, so speak with an accountant about your specific tax position well before listing.
Your lawyer's statement of adjustments will need to account for the tenant's security deposit and any prepaid rent, transferring both to the buyer at possession rather than to you directly, since the tenancy continues under new ownership unless the lease says otherwise.
Joel Dyck has sold occupied rental properties across Saskatoon and can walk you through how buyers value a tenanted home versus a vacant one. Get your hand-reviewed valuation from Joel Dyck.