Thanks, yes, the -m option was required. I only have Python3.8 installed so this works for me:
python3 -m ocr_joplin_notes.cli --mode=TAG_NOTES
I am just about to post all my "instructions" for getting this running in Windows which you are welcome to borrow from for your Github README.md.
Here are the Windows installation notes OCR in Joplin (How to) - #3 by myfta