not it has not yet happened. the hard fork is apparently scheduled to happen on November 1. what is already over is the block that they used as their reference for distributing the BTG coins.
you can already see what the bitcoin price is!
and you can also see the BTG price which is very different in different exchanges. i have not checked bitfinex yet but in yobit it was 0.08BTC=456$
Yes and earlier today yobit started with 600usd/btg.then its down to 400usd right now.
But yobit is locked for 2 days now.
And personally i donot trust them eaither.