Works fine with the bars appearing almost instantly. You do have to follow the instructions and jump through all those hoops needed to get a Youtube API key though, otherwise if you use the public "Invidious" key instead then only some of the thumbnails get the bar and only after waiting several seconds.

Pity this addon doesn't use that API key to add a tag to the thumbnails to tell you if they're available in HD or not, because that's the other thing that tells you if the videos are worth watching or not.