About release date:
Any version of VCVRack v2 beta has a build number - the beta v2 plugins have to match that build number.
Many developers have announced their v2 build in this thread.
https://community.vcvrack.com/t/plugins-that-are-built-for-rack-v2
Some have available binaries, others you have to build from their source trees - often hosted on github. Pulling the branch that contains the v2 build - it can be named to the liking of the individual developer.
An example, Audible instruments (note the --branch v2):
git clone --branch v2 https://github.com/VCVRack/AudibleInstruments.git
A list of v1 independent developer hosted repositories and plugins can be found here:
Instructions for building are available on the official vcv-rack website here