A fun statistic is your 10 most valuable items. You can find the list in your Showcase -
The prices get updated daily and you can see an overall valuation when you click on the green chart icon (the orange icon explains more on the calculation and the black one when the calculation run the last time) -
And here is what the chart looks like -
You will find some stats on your overall collection value and the same time of chart on the top (mobile) / top left (desktop) of your Showcase.
The Stats run roughly every 24 hours and there is a time-stamp -
Please note that if you are a new user you will not see any stats for a day or two. And if you do not want to share either of these stats publically you can mark them private here.