"compost" and "potting mix" are often used interchangeably, so look on the bag label for the contents.
Your bag of mix should tell you if nutrients / fertilizers are incorporated into the ingredients, and what they are, and give you the amounts. If it says anything about 'feeds' or 'nourishes' plants, that's a key that some nutrient providing elements are included. This should be all the fertilizer your plants would need for a season or so. Other mixes might just include combinations of composted wood fibers, peat, or coco coir with 'grit' like perlite, pumice or sand. These mixes will not feed your plants, and you would need to fertilize them in your choice of ways.
I think your product in Australia lists the following: Blood & Bone meal, Fish Meal, Seaweed or seaweed extract, chicken manure, Feather meal .
All these would be fertilizer ingredients.
*** update: oops, Daisyl beat me to the post