Are my bitcoins safe in online wallet
www.blockchain.info for what happens on August 1?
I have my private keys & my account is fully secured.
I really need to know this

Probably not. Your coins were never safe with blockchain.info anyways since they continuously have security and usability issues anyways. If a chain split happens, you won't be able to decide on which chain you want to transact on, blockchain.info will choose that for you.
That makes it safer for the bitcoin users because wallet companies are the ones responsible for selecting the right chain for their users.