I'm not shure if I understood well, your question is how to find the version number of your Kali distribution ?
The command lsb_release -a
gives you the version of the distribution.
Yes you can connect with openVPN. Make shure to have the newest version of openvpn and openssl installed.
To connect, you can use your Network Manager.
With KDE GUI there is the comfortable tool NetworkManager
With Gnome and other graphical Linux GUIs there are equivalent tools.
You import the config-files
in your manager, copy-paste the SHA512(your-token) in the username field and leave the password-field empty (or take the "standard-password" 93b66e7059176bbfa418061c5cba87dd).
You can also use a GUI for openVPN to install the connections.
Third solution: you launch in a simple konsole-window openvpn --config theconfigfile.conf
(You must probably launch openvpn as superuser.)
In this case, you have to create a file somename.txt with your hashed username and standard-password (file with two lines) and write the name of this file in your config-files, at the right side of "auth-user-pass". (In the config-file there must be written "auth-user-pass somename.txt" instead of "auth-user-pass").
Then you launch the command from above and you'll be on.