What's the slack address?

Yes...segwit already running

If your wallet have more than 10 BTX = from 00:00 Monday you can wait 3% reward. Don't know your timezone...

Your computer does neither have to be turned on nor online. You just have to have your Coins in local wallet and not on an exchange. There is no minimum reward. You are getting 3% if you have at least 10BTX in your wallet, that's it.
Some examples:
- before: 10 BTX after:10,3 BTX
- before: 9,99 BTX after: 9,99 BTX
- before: 12 BTX after: 12,4 BTX
- before: 3000 BTX after: 3100 BTX
- before: 4 BTX after: 4 BTX

the new client is syncing?

Has still forgotten to specify - 00.00 by what time? If I live in Moscow, then the calculation will be made automatically according to local time or not? Payment is automatic (after 00.00) or after some time (hour-day)?

The devs always just say "on monday", without telling a specific time. You just have to wait for tomorrow, until they post here or the airdrop arrives in your wallet, in order to know when exactly the airdrop was made.

I think for most of the people it's not about the time when their airdrop coins arrive at their wallet. It's about to know when or until when the coins have to be at your local wallet and therefore when they can again be transfered anywhere else (mostly to the exchange I think). Can't you just say, we make the snapshot between XX:XX and YY:YY (max 2h) and the airdrop is going to sent out any time later that day? Or is there something I don't see why this would be a bad idea?

And I just have to say, I love the new diff adjust algo. It's much more predictable and produces very stable block times for the moment.