It is since version 0.19.4, released last June: join-lemmy.org/…/2024-06-07_-_Lemmy_Release_v0.19…

Your instance hasn’t updated yet, and does not have a timeline yet: lemmy.world/post/20234434

If you want to try it, you can migrate by exporting and importing your settings to a new account on another instance.

lemm.ee , lemmy.zip or lemmy.dbzer0.com are popular choices