It looks like the original publication of the timeline was on Avid (the video editing software)'s Facebook page on March 1 [1]. I haven't seen any publications older than that (yet).

The timeline was later published to their YouTube channel 4 days ago [2].

[1]: https://www.facebook.com/Avid/videos/-the-full-editing-timel... [2]: https://www.youtube.com/watch?v=upTs-HTThMM

How is the collaboration done when composing? I can't imagine multiple humans sitting on one computer.

Would be nice to know what software that is.

Avid Media Composer

Is that what big budget Hollywood productions use?

Some, yes. Adobe products also widely used.

Fun story from a friend who worked on Dune 1:

Big films like Dune can push these products to their limits in unexpected ways. Avid product support apparently can dispatch live humans to your workstation same day if the software is not working as expected.

I have never heard of a support person being helicoptered in, but I wouldn’t be surprised if it has happened on a big budget production that was blocked by a software issue.

Do you know what computers do they use to edit Hollywood movies like Dune for the final cut?

Do they use MacPros, workstation PCs or do they have some local sever farm?

Its one of two or three editing suites used industry wide, so most likely. Also has been around the longest, iirc. Surprisingly easy to learn the basics in a few hours, maybe try it out sometime.