Was streamed live on Twitch here. Here's the YouTube export of it for the people that prefer to watch it there. Time stamps to each boss are included in the description of either video.
Here is a useful link that goes along with the tutorial that will contain all resources mentioned in the video including button layouts, the timer, splits for the run and much more. https://pastebin.com/ekXcVFM3
Good luck on your Cuphead speedrunning journey! :D