PostEaseWhy a generic answer is close to useless
A "best time to post" figure published anywhere else is an average across accounts with audiences unlike yours: different countries, ages, and habits blended together. Facebook has no fixed daily peak that applies to every Page. It has your Page's own audience, whose active hours you can only learn from your own numbers.
Why timing matters more on Facebook than it might elsewhere
Facebook's ranking leans heavily on how a post performs with the first people who see it before deciding whether to show it more widely. A post published when a meaningful slice of your actual followers are active has a real head start over one published into a quiet window, even if the content is identical.
How to find your window
Check your Page's own audience-activity data for when your specific followers are online, then test a consistent posting time across several weeks and compare early engagement, not just total reach. Your own Page's history will always be a more reliable guide than a generic benchmark, because it already reflects your real audience.