The profit can't be estimated because the BTC balance is withdrawn to the payout server, in preparation of the payout to the users.
The EXACT profit, of course, can't be estimated.
But the approximate profit based on the average previous rounds coins/shares calculations and current coin market price can be easily estimated,
I guess that Wafflepool uses a similair simple algo when estimating, the numbers (shown below) grow every 10-15 sec, and this growth has a really hypnotizing effect )))
Bitcoins earned (not yet sent): 0.00211722
Bitcoins unconverted (approximate): 0.00173536