No, they haven't released mainnet to public yet, they say it'll be released during Q4 and token swap will start then as well.
Right now they released new testnet version which is rather stable, so you can play around with it. I've been running a node since Saturday, works fine for me, It took me some time to sync though.
Token swap hasn't started yet. I think it'll begin either along with mainnet release to public or a bit earlier. Either way it'll be announced once it's decided. As far as I know Exchanges usually support token swap processes and does it automatically and I guess CS won't be an exception in this case.
there are many credit holders in various exchanges and personal wallets and I also don't want to miss this opportunity, because swap usually has a time limit for the holder to swap it immediately. thanks for the information