If I send my SHARE to the exchange now I will start staking at 60% rate or it didn't start yet?
Not yet, staking will start when the initial FeeShare sale closed and will stop when no ShareCoin is left in the exchange's wallet.
And FeeShare sale will open again to generate ShareCoin for the exchange's wallet, and then when the sale closed, it will start paying interest to ShareCoin's owner, and stop when no ShareCoin left, and the FeeShare sale will open again to generate ShareCoin for the exchange's wallet, and then when the sale closed, it will start paying interest to ShareCoin's owner and will stop when no ShareCoin left and will open again,etc..... this keep on going
until 50,000 FeeShare are distributed to the community.