There are a lot of posts that debate that question.
Try Googling : best time to post on steemit
This post was written 10 months ago which is eons ago on Steemit. There are more people here now in different time zones so things have changed.
Here's another site you may find interesting.
and
😱 where was I? Ten months Steemit has been at it and I've been oblivious to it!
I only came across it a couple of days ago and wasn't sure what to expect. Now I'm getting truly involved with the Steemit community and looking forward to a long journey here!
Thanks for your tips. They are priceless!
Upvoted and followed!😜
Welcome to this amazing thing of ours, Steemit.