It’s ready for testing.
Download it here. The functionality to make NewsBlur a feed reader works with macOS 10.13+; it also includes a Safari app extension for macOS 10.12.6+ and Safari 11/12 to allow the ‘o’/‘v’ keys in NewsBlur to open stories in background tabs.
Source and documentation is currently here though it’ll be merged into the main NewsBlur repository eventually.
You need to enable the Safari app extension in Safari’s Extensions preferences if you want to use it. If you currently use my NewsBlur Open in New Tab Safari extension (which will stop working as of Safari 12 in a couple weeks), make sure only one of these extensions is checked!