Basically that (see e.g. rfcs/rfcs/0026-staging-workflow.md at 45b76f20add8d7e0e1d0bc0eed9357b067c899a6 · NixOS/rfcs · GitHub).
In this case you could subscribe https://github.com/NixOS/nixpkgs/pull/115394.
AFAIK staging merges are quite infrequent so this’ll usually take a few days/weeks (on master it feels like staging-next is merged roughly once or twice per month).