How do I know when my domain’s DNS has resolved?

You will see an index list of files and/or folders when you access your site via your real URL both with and without the ‘www’ (http://www.yournewsitename.com and http://yournewsitename.com) in a browser.

When you can see the index list of files and/or folders at BOTH different url’s you know the DNS has resolved.