If you would really want to access your bitcoin gold right after the fork has happened, you should move your coins from coinbase to a wallet like electrum (you own the private keys of this wallet). If you're using Coinbase this is NOT the case. You will only receive your bitcoin gold if coinbase decides to and only when they release them. I believe coinbase still hasn't released the bitcoin cash from the previous fork.
If you go the Electrum route, you may stumble upon a period where you cannot access the coins because there is still no software for Bitcoin Gold Electrum equivalent, so you will not be able to export your seed.
Similarly, users that went the Electrum route with BCash had to wait for Electron Cash, and I still wouldn't trust that program.
It's bet to man up and get your node running. All these forks are forks of Bitcoin Core, so if you run a Bitcoin Core node, you will have instantly access to your coins by copy-pasting the blockchain files, you will just need to wait for the blockchain files to be validated which can be a pain in the ass depending on the power of your computer, but I think a day or two max.
thanks for the information and enlightenment, Just wanna know which exchanges will support this fork by giving equal amount to btc holders/ I remember August 1st when those who saved their btc on exchange sites got advantage and sold bch at a high price. These exchanges weren't accepting bct deposit for something before they activated that so just need help which exchange supports this fork.