The last info I remember is that they wanted to try to incorporate some kind of help concerning this upgrade into the Easy Installer. But no OTA upgrade.
Do you have really important things on the phone? Just saying, it’s a computer device, it can fail you completely at any time. What’s the plan then?
Unfortunately Android isn’t much help with easy local backups, and I don’t use the cloud for backups, so I can’t say much about that, be it Google or Murena. Some pointers …