Samsung phones don't use fastboot. And the build on SourceForge is Sascha's build with currently broken kernel. But don't worry. I spam him everyday on Telegram to give me a working Oreo kernel . He's working on AOSP every day. So just wait guys. Development would be a lot faster if Samsung gave us Oreo. But it seems like they want to update their older flagships first(S8, S7E).
Ohm, i have official Oreo build on my note 8 ?