Alan Watt is apparently still on holiday. One easy way to tell that today's show was a rebroadcast of something older is by listening to the first few minutes of the audio file that RBN posts in the archives. If it's a live show, the musical into lasts about 30 to 40 seconds and then fades into Alan's greeting. If it's a rebroadcast, the music lasts for 2 to 3 minutes, and Alan comes on in mid-sentence. Sometimes RBN will post the date of the original broadcast, but not today.
If you really want to hear today's mystery rebroadcast, the file is here:
I suppose it is possible that Alan might be back with a live show tomorrow, but at this point I suspect it will be Monday.