Commission in Saskatchewan is negotiable and is agreed with the brokerage in writing before it applies, per the rules the Saskatchewan Real Estate Commission enforces on every licensee; it is not a fixed, published rate, and it is often tiered, a different rate on the first portion of the sale price than on the balance.
What that commission is meant to cover, marketing included, is worth confirming in writing before you list, since brokerages structure their fee differently and a seller should know exactly what is bundled in before signing a listing agreement.
Ask for that breakdown up front and get it in writing rather than assuming what is included. Get your hand-reviewed valuation from Joel Dyck.