Honestly, no one can tell you that yet. Since to my knowledge, no one has been hired or at least gone through training as a DEC yet. This was just announced a couple of weeks back.
LAX is senior, or i should say most domiciles west of Denver are senior on both airframes. As FO you can most probably get any domicile within 3-6 months. But as a CA i'd assume you would have to spend time in
DTW(CRJ only)/MSP/ORD/DEN for a bit.