Bitcoin Cash Hardfork from Bitcoin

Bitcoin Cash will hardfork from Bitcoin forming a second blockchain at 12:20 pm UTC which is 8:20 am E.S.T. tomorrow August 1st, 2017.

Countdown Timer to Bitcoin Cash Hardfork

here

1:1 Bitcoin Cash for Bitcoin

Note again you will receive 1:1 BCH for every BTC you own (e.g. now: 5.3 BTC after: 5.3 BTC and 5.3 BCH).
but you must have access to your bitcoin private keys through

1. a paper wallet
2. your seed into a hardware wallet or
3. holding your bitcoin on a exchange or online wallet that is supporting bitcoin cash. Many such as Coinbase are not.
   See the Table for a list of exchanges and wallets that are supporting Bitcoin Cash
   here