Okay, first, a point of clarification: There are no universal best times to post on social media for every single brand and every business.
Each brand’s audience is different, their behaviors and interests are not the same, and as such, there’s no one-size-fits-all, prescriptive approach that’ll ensure that you get the best results every time that you post.
That said, “best times to post” guides can be helpful, in both highlighting broader trends in engagement, and prompting you to think about when you might want to start your experiments, in order to find your ideal posting cadence.