The cp37 indicates you are using Python-3.7. As mentioned in the instructions, SNAP provides binary wheels for jpy up to Python 3.6, so, unless other tools you want to use require 3.7, you should create an environment for Python-3.6 to use with SNAP snappy.
Be sure that the simple tests in the referenced document work before going further so you don’t end up creating new problems.
If you need other Python software that requires Python-3.7 then you will need to create your own binary wheel. This does work, but is not a well tested configuration so could introduce problems, that don’t occur using Python-3.6.
I recommend that you avoid installing snappy in your Python-3.x environment because there are other packages called “snappy”. The instructions you reference provide a method based on modifying python scripts that used SNAP snappy by determining the location of the SNAP snappy module from the USERPROFILE environment variable.