First off, there is no one best time for every single one of you. Your best time post on Instagram is going to be different it all, comes down to the audience you are trying to attract.
If you want your posts to have the best chance to go viral, you want to get as much engagement and reactions as possible, as early as possible.
Post when you audience is most likely to spend time on Instagram so that they can actually see your post and respond to it if they like it.
I have tried different posting time myself and true enough timing matters.
If you are targeting busy moms, the best time to post might be after they have dropped the kids to school in the morning or after putting them to sleep at night.
If you try to reach the typical 9 to 5 it might be hard for them to see your posts in the daytime while they are busy at work.
The best time to post is when your audience is most active.
How to know the best time on your Instagram account
You can find that easily inside professional dashboard on your profile > right at the bottom of your total followers you will see the recommended posting time.
Your focus should always be creating relatable content your audience needs, they will find it!
Everyone is looking for that magical perfect time but nobody is looking at their insights to see!
I find an hour before the time my audience is most active works best for me. Target audience plays a vital role in every little aspect of marketing.
You will need to figure it out by posting at different times and see when you get higher engagement on your post.
100% people always say best time, do what works best for you!
Everyone has different struggles which is why you cannot compare your journeys.