The Omnis docs state "node.js is embedded into Omnis Studio".
I understand I can check node.js version in terminal node -v, however this is the version on my machine itself.
How do I determine what version of node.js is bundled within Omnis Studio?
After installing it, you can go to the directory that contains Omnis' Node executable. On Windows, it may be:
C:\Program Files\Omnis Software\OS 10.2 31315\clientserver\server\remotedebug
Then you can run node -v from that directory. The latest version looks to be 16.6.1. (This may well be a different version from the global Node on your personal machine - for example, my global Node version is 14, which I get when running node -v elsewhere, outside of that directory)
The latest release notes also say that the Node version in Macs is also 16.6.1:
The version of Node.js released with the macOS version of Studio 10.2 is now V16.6.1 which supports node running natively on macOS on M1 machines.