I'll get back to you as I am about to start a new facility, but I can tell you what it looked like for me in a rural setting as the only OB trained nurse on my shift:
Keep in mind we were a rural hospital so this probably atypical, but we had to be creative with resources:
If no active labor- I did couplet care for up to 8 mom and babies. (I never had more than 3 pairs). If I had an active labor, I would have a CNA round for vitals instead of myself, and I would check in on mom and baby periodically after my initial assessments. (I'd probably have cross coverage from outgoing OB nurse while I did my initial rounds).
For labor and delivery I provided the care from labor to transition to the postpartum wing. At the time of delivery I had to call an M&S nurse who would stay until we were sure the baby was stable. I think less than 30 minutes. All our M&S staff were baby friendly certified, Pals, ACLS, and usually NRP. Once baby was determined to be stable I sent them back to their ward because in most cases I am doing nothing in the first hour except guiding the bonding and occasional VS checks or fundal checks on mom.