Can you take a pic where the water line is . Whaere I live DWs have to have their own electrical circuit but the water is hooked up connected to the sink water. I am truly not sure how that works but really you need to ask the builder not us.

It's pretty typical for a dishwasher to share the same water source and drain as the sink.  I wouldn't worry about this.

“Do they just share the water from the sink rough-in and is that just connected after?”

Yes and yes

Make sure there are enough outlets under the sink, if you also want to run a disposal and air-switch. All pretty standard these days.

Thank you!