Volunteer in the gate, confirm your update with the agent, and talk to about lounge accessibility when ready. Dinner provider on my night flight started about 20 minutes after takeoff by using a hot towel, beverage and combined nuts. Evening meal was served ten minutes later on a single tray https://businessflightshop.co.uk/blog/how-to-find-the-best-first-class-flight-before-your-next-trip/