If I have catcoins at exchange, are they "safe" there in term of this fork ? (i know exchange owner can run away with them, but that's not what i'm asking here:) )
You can withdraw them on whatever chain the exchange is on. If they update to the forked version, you'll be fine.
If you want to be on the safe side, withdraw them before the fork happens. That way you can spend your coins on both chains, no matter which one survives.
but If I withdraw them now, will they even get processed by the time fork happen? I have them on cryptsy.
The fork isn't scheduled to take place for another 24 hours. Even if the block time is being misreported and it's closer to 4 hours per block (I'm not sure what the real value is at the moment, I think it might be more like 2 hours), you should be able to squeeze in a transfer by then. I just decided to move my CAT off of Cryptsy in preparation for the fork myself, frankly I don't trust them to handle it very well, if at all.
Cryptsy nearly instantly registered the transaction, and my CAT is currently sitting in my wallet (although unconfirmed of course).