they will do both interviews. be ready and bring spouse just in case (must likely they won’t call you spouse). decisión can be made same day or a month after. Oath can be same day or 3 months later, or any day in between.

due to new policy they can waiver your i751 interview... if you submitted sufficient evidences & documents they can approve i751 same day or before n400 interview... good luck

thank u friends