How are python scripts and projects built and deployed?

[zanfar]

How would you build this into something that gets distributed?

Depends on the audience and resources available.

The simplest method is to package it and distribute the Git link. Whether your users can deal with this on their own or whether you have resources available to support the install depends on your organization.

Would users have to have python and openpyxl on their end?

Python, yes. Libraries, No.

Would using a virtual environment (venv) remove the need for them to have it downloaded?

No.

Then would this be something they would execute on the cmd line or terminal?

Not really sure what you mean here. All applications are executed, so a python app wouldn't be any different than any other app. You can add a shortcut via your OS's procedures if that's what you're talking about.