Exporting a Single Site from Multisite

https://premium.wpmudev.org/blog/import-export-wordpress-sites-multisite/

I have a client that is getting some free help from a friend. He wants to setup the site on a standalone system (single wordpress install).

He said other agencies give him a tarball that is created via command line on PLESK and he has everything. Plugins, themes, settings, etc, etc.

Based on the article above, it looks like there isn't a way to grab everything in one shot. My question is what' the most painless way to give him a complete export?

These are good friends of mine so I don't mind going through a few extra steps.