https://Rewind.ai has a MacOS app which claims to "find anything you’ve seen, said, or heard", e.g. recording meetings and app interactions to local storage and doing offline speech-to-text and OCR conversion. Their query interface uses OpenAI and roadmap includes Apple headset.
2022-11 launch: https://twitter.com/dsiroker/status/1587415342896148480
2023-04 pitch claims ~2.5K paid subs and ~25K free tier: https://www.youtube.com/watch?v=AqgdnW_J-vQ