BTG coin should appear as an option on 1.11. So snapshot is done but the trading is still not possible. Official response from Coinomi:

"Block 491407 was simply a snapshot of how many BTG you will have after the fork is active. According to its developers, activation is scheduled to happen on November 1st. You will be able to add a BTG wallet and access your coins then. Of course, you are free to transact your BTC, and it won't affect your BTG."

So be patient