Posts can be scheduled up to 75 days in advance. To do this, you need to create a new post, click on the three-dot menu in the upper left corner and select "Schedule". After that, the post will be saved in the Drafts folder, where it can be viewed, edited, or deleted.
In addition, Threads is adding the ability to "markup" a post that a user has decided to share. This feature will allow you to sketch or highlight important points from a shared post.
Mosseri said that the new features are currently only available in "a few countries with more to come soon."