Hmm, I think it depends! I focus more on getting views from the followers I have on twitter and instagram, since I don't even know if I get any viewers from the "fresh" page here on tapas. So, I usually post the updates on my social media on the days and hours when my instagram followers are most active (if you set your insta as a business profile you get access to some statistics), but I can always retweet or post an insta story later for my followers who might have missed it!
Just as an example, the most active days for my followers are between wednesdays and saturdays, the least active days are sundays and mondays, and the most active hours are between 18h and midnight (sometimes between 12h and 15h too). So, I update on wednesdays and saturdays at around 18h
But other times might work better for other audiences, so idk... also, if you have international readers you can try to find a time that works most people! For example, when it's around noon on most of Europe and around 18h on most of the Americas...