Monitoring APFS Drive Decryption Progress

I recently decided to [permanently] decrypt an APFS volume via Finder (Right click the drive, choose Decrypt).

There wasn’t any indication that it was actually working. After some web searches, I pieced together a one-liner to monitor the progress of the decryption operation. This will refresh every 60 seconds. If your setup is anything like mine this will be an exceptionally slow operation.