You’re basically asking Radarr to do something it already does.
You say you “don’t want to set up Radarr”, but you already have Radarr installed and running for metadata. Radarr has:
• a built-in calendar showing upcoming releases
• quality profiles that let you define exactly what counts as a “good” WEB-DL/WEB-Rip/BDRip
• native notifications, webhooks, and external services like ntfy
• the ability to automatically grab the movie the second your preferred quality becomes available
If all you want is “tell me when this movie is available in proper quality”, Radarr already tracks that state change internally. You don’t need a custom script. Just enable notifications or a webhook and let Radarr tell you when the movie switches from “unavailable” to “downloadable” in your chosen profile.
You’re already using the exact tool designed for the job. No need to reinvent it.