Unfortunately, the current mastodon UX does not have explicit support for threading posts like twitter does:
https://github.com/mastodon/mastodon/issues/8615
and therefore, threads will flood your followers' timelines and show up in reverse chronological order, potentially interleaved with unrelated, concurrently published, posts by other people they follow.
A potential stop-gap solution would be to publish only the first post and then mark the subsequent threaded reply posts as "unlisted":
https://docs.framasoft.org/en/mastodon/User-guide.html#toot-privacy
[The Doctorow Problem] Fold toots in a thread, only display some of them in timeline · Issue #8615 · mastodon/mastodon
Currently, when someone composes several tweets in a thread, this quickly swamps the timeline: This is undesirable, especially when the topic is not interesting to me. Twitter has (in my opinion) i...