18 Sep 2022
Location of iCloud Drive on macOS Monterey:
/Users/xxxx/Library/Mobile Documents/com~apple~CloudDocs
weirdly enough though, while the above is the link that gets copied when selecting the folder in Pathfinder, the location seen is:
/Users/xxxx/Library/Mobile Documents/iCloud Drive
Also, not all folders/files I can see in iCloud Drive with Finder show up when looking at the folder with its full path with Pathfinder.
It seems only folders I created show up here.
Need to figure out how to access the app-created folders in iCloud Drive, to access the Just Press Record folder for Transcribee Transcribee.   
Found it - each app has a separate folder in Mobile Documents, so:   
/Users/xxxx/Library/Mobile Documents/iCloud~com~openplanetsoftware~just-press-record/Documents
Python snippet to access:
import os, os.path
count_files = 0
for root, dirs, files in os.walk("/Users/xxxx/Library/Mobile Documents/iCloud~com~openplanetsoftware~just-press-record/Documents"):
    print(f"{root=}")
    # print(f"{dirs=}")
    # print(f"{files=}")
    # print()
    for x in os.listdir(root):
        print(x)
        if os.path.isfile(x):
            count_files += 1
    print()