The Adobe help pages are the source of the following:
"The Auto Import feature automatically imports photos into a Lightroom Classic catalog or a collection by monitoring a watched folder for photos and then importing them into a catalog. After you specify auto-import settings, you can simply drag photos into the watched folder, and Lightroom Classic imports them automatically, allowing you to bypass the import window."
In other words, the functionality you seek is already a built in feature of Lightroom, and all you have to do is target a folder for Lightroom to watch and have your script save the files there. If Lightroom is running, the process is immediate, if not, it takes place on the next launch. Several useful user-set prefs inside Lightroom, the help files are instructive.