It is in Alpha 3, next stage is beta: https://www.dualthegame.com/en/news/2019/12/04/roadmap-update/
Tests are usually 4 days a week, but varies: https://www.dualthegame.com/en/server-status/
The beta key/s you get with pledge you can give away to someone else when beta starts, you get alpha and beta access.
1 DAC = one month subscription after release, so it is like a pre-order of 3 months for the $60 pledge