I see the dates when you click to view the post itself, however, it would be helpful as a teacher using thinkific courses to see the date/time of publication in the main list of posts.
Positioned to the right, maybe after the name of the author.
Maybe even the date/time stamp for the most recent comment within the post as well on the main list of posts. Just underneath the number indicator of comments and likes. Having two time stamps could get confusing.
If I had to pick between the two... I would probably choose the second. Seeing the timestamp of the most recent comment or reply.