So it looks like we have the details already in Discourse - all user have access to these reports.
These two videos show the top users and top posts respectively.
You can change the timescale (daily, weekly, monthly, quarterly, annually) and you can choose the metric you want to look at.
What is missing is that this isn’t currently front-and-centre on the forum.
I would envisage creating an automatic daily/weekly/monthly post from Optimus Trouser Two Dot Ohh that told everyone the current leadership standings and linked to the full report.
Top Users
Top Posts
*Ignore the actual stats. They’re skewed by data import/scraping problems that I’ve had getting the content from sotonians.com.