Realme has confirmed that it will make a leap to phones with 108MP sensors in 2021. The phone most likely to be the first with this top-end spec is currently rumored to be one of the upcoming 8 series. Therefore, it might be unveiled at the OEM's Camera Innovation Event, set for March 2, 2021.
https://www.notebookcheck.net/Realme-will-unveil-its-first-108MP-camera-at-its-upcoming-Innovation-Event-in-March-2021.524538.0.html