I flew BOS-DEN-PHX in October and got no fewer than six texts from WN. The app updated every 10 minutes it seemed.

Original wheels up was 7p. Text 1: 945p. Text 2: 9p. Text 3: 845p. Text 4: 8p. Text 5: 10p. Text 6: 710p. We were off the gate at 730p-ish.

Be careful. You can usually bet that a smaller station will not juggle airplanes too much, but any of the larger stations can and do swap planes at a moment's notice. An inbound could be two hours late and you could push early.