If you are a Razer phone user, there is a good news for you as Razer official has announced the firmware update period for their first smartphone. During the launch, the Razer phone does come preloaded with Android 7.1.1 and it has yet upgraded to the newest Android version available by now.
However, the Android 8 firmware is in the late beta stage and expect to be available for download by end of this April through OTA. In the other hand, it is possible to get a chance to taste the new firmware through the Developer Preview edition in this link. Keep in mind that there might be bugs in those beta firmware so take caution.