Show build status

It would be really helpful for non-technical users to get information about what's going on during the build to know if the post is already live. Depending (it seems) on how busy the Netlify bots are, we're seeing short and also very long build times. This is very confusing for authors since they are never sure if something went wrong or if it just takes more time.

Would something like the [preview links for published content](https://www.netlifycms.org/docs/deploy-preview-links/#preview-links-for-published-content) be possible also for the live version? A `check build status`?