I had FTTF on Glory last month in NOLA. There is a separate line at entrance to building, just show them your boarding pass with FTTF showing. We were directed to sit with general boarding, but were called after the other priority boarders. They checked boarding pass several times when we got into boarding line.
BTW- also self-disembarked. Meeting time was 7:15am, I was out of terminal before higher priority people since I took escalator instead of elevators. Was at my shuttle bus by 7. very fast and easy with facial recognition.