A couple notes for anyone trying it: 'Notes' has to be running & there has to be an existing note with the first line 'Terminal Note'. Both could be handled if anyone wanted to make it more robust.
This will be great for shooting specific tidbits of info from my work computer to my iPhone (which aren't connected via iCloud).
iCloud Drive or CloudKit-esque storage would be nice, but the regular Notes app uses IMAP for storage, for what I imagine are "legacy reasons". (The Notes feature was originally built in to Mail.app and used IMAP notes. Yes, IMAP has a notes feature).