Trello is great for planning out your work, but if you're trying to keep others up to date with what's happening, an easily shareable format like an RSS feed might be preferable. This automation will monitor Trello for new cards moved onto a specific list; each new one it detects will automatically be posted as a new item to a custom RSS feed, letting everyone know about your progress when you're ready.
RSS (really simple syndication) is pretty much the industry standard for feed readers. You'll find RSS feeds in almost every app imaginable.