any info for the PoS mature time and reward?
50 confirmations to reach maturity. Reward is 20 TWIST.
how much is maximum supply ? (I see 200M was POW)
TWIST has no maximum supply. It will be pure Proof of Stake after block 20000, and it has an annual inflation of 10%. However, that inflation amount assumes that every single coin is being staked, which is obviously not going the case, so the actual inflation will be less.