http://calc.btgpool.proSupposing to have a small rig with 2000sol/s of hashing power:
Network Difficulty
539161
Network Hashrate
14.747 MSol/s
Exchange Rate (Bitfinex)
$244.48 USD/BTG
0.0426 BTC/BTG
Electricity cost per day
$0.00
Revenue per day
$56.91
Profit per day
$56.91
It's true??
No, not really.

Since mainnet is not operative till next 3 hours, that calculation is pure fiction and far from real.
So I suggest you to relax and have a beer

btw Blockchain Height current value: 496157 / 499407 (3250 blocks left) (sync in progress)