Do I really have to wait until this plugin is created? Took me several hours to download QIIME2-2020.2 and it could be great I don't need to go back to the QIIME2-2019.10 version.
Yep, because its a community plugin, so the URL you linked to first is right:
The plugin already exists! Follow the installation instructions listed at the Library page you linked to, inside your 2020.2 environment and you should be good to go!