Instagram introduced a live video scheduling feature recently. With live scheduling, creators will be able to build up the buzz, as much as 90 days in advance, and make followers anticipate a big announcement, an upcoming event, or even a launch.

source https://gadgets.ndtv.com/how-to/features/instagram-live-video-schedule-post-create-how-to-steps-guide-2584427#rss-gadgets-all