Last time bittrex and other exchanges confirmed listing way before the fork. This time there hasn't been any announcement so don't expect btcgold listed in any serious exchange.
Either way it's a snapshot, and btcgold will be credited like 1 month after for all users. The best option if you want this shitcoin is keep your btc in your wallet or a confirmed exchange.
Sure that all the exchanges will list Bitcoin Gold same as what happened to Bitcoin Cash. Most probably Bitcoin gold like Bitcoin Cash will be one of top coins on coinmarketcap. So It is attractive for all the exchanges