There can be a lot of down time with the baby delivery. My wife just had a baby but this one came too soon to survive.
We do have one healthy natural birth.
Tips:
Hot shower. Warm water on the uterus helps ease the pain of contractions.
Walk around. Walking around helps move the hips and gives the baby some motion to "drop"
Food & water. Blah blah blah don't eat because you could be in surgery. Your wife is running a marathon with her contractions. She needs nourishment and hydration. A lot of mouth breathing will dry her up.
Avoid drugs. Drugs that immobilize mothers can lengthen labor. After delivery, if she avoided drugs, it will make her recover faster. My wife started labor at 5am, started "pushing" at 6pm and delivered at 10pm. Drug free. After that she jumped in the shower a 1am and looked ready to go in the morning.
Don't you know all this stuff?

Little late to ask.
Call your doula. You did retain a doula, right? If you had you wouldn't be posting looking for advice.

Different labor positions. Works just like walking. Squat, hands and knees, what ever feels best.
Stimulate the nipples. I'm not kidding it's supposed to work.
Positive mental images. Lot's of moral support.
Follow your birth plan. You do have a birth plan right?
Get the baby to the breast asap. They know what to do. The human body is a natural warming blanket for babies. Steady breathing of mom will help the baby adjust to the cruel cruel world.