I had the same issue. Try to reboot your phone and make sure you have installed the latest /e/ 0.2 build by checkin in the system updates menu. If not do it. Only after that the 0.5 show itself on my phone. Hope it help!
Edit: Oh and don’t forget to follow @GaelDuval instructions after the update. You can see them here: [PLEASE READ OTA] Moving to 0.5, changes, need to re-enable eDrive