Can the drains for a shower and sink come before the drain for the toilet Example the sink and shower then comes toilet then enters main stack?

In my experience I've seen this type of scenario in older buildings. Usually the sink will tie into the stack in the wall while the shower generaly connects in below the toilet also known as the closet bend. In alot of older houses and apartment complexs they have tied multiple drains together in a smaller pipe before going to a larger one. For example the lav with the tub, the kitchen sink with a tub, or all three together.