Get a text message when new podcast episodes are published. Search podcasts on Listen Notes, the best podcast search engine. Use Zapier to connect the RSS feed to Twilio (for sending SMS messages).
Step 1: Search podcasts on Listen Notes
On ListenNotes.com, search a podcast by name:

Image: Search podcasts on Listen Notes.
Get the RSS feed of a podcast (Example):

Image: Get the RSS feed.
Step 2: Use Zapier to send email notifications
Make a new Zap.
Select "RSS by Zapier" for "When this happens…" and set up the RSS feed.
Then select "Twilio" for "Do this …". You need to create a Twilio account first.

Image: Set up Twilio.
You can also set up a Listen Alerts rss feed or a Listen Later rss feed (Example) and get notified for new episodes.