I think there is no time to post on steemit. At any time you can post on steemit. If you want to told what is the time for post on steemit and get more than I want to tell you that in this fact there is no specific time to post on steemit and get more upovote. If your make quality content then whenever you post on steemit this is not fact. If you will make quality content and if there is anyone who love your content then I think he or she will upvote you.
At last, I think that there is no specific time to post on steemit and I think every moment is best for posting on steemit.