I'm not sure I understand the question, but, if you are talking about a sitemap then I suppose you could submit it as soon as it is indexed within their search engine. A lot of my old articles have creeped their way to the top of Google, where as the newer ones remain some where in the depths of Google until about a months time where they then find themselves on pages 2-5 (In which I then focus on bettering my SEO to bring them to page 1).
I am not sure what you mean by "Wait till it's featured" as in all reality it may never be "featured" as lets say Hub of the day. I have written 34 Hubs or so and only 1 has been hub of the day. But, even so it took about 2 months for it to make its way to page 1 of Google.
I suppose to answer what I think is your question, you should be able to send Google a sitemap as soon as your article/ articles have been indexed. One way I find out if my articles have been indexed in Google is to search the exact title and then put hubpages at the end. If it doesn't appear there is a good chance the spiders have not crawled overt he page yet. But, if it is an article on Hub Pages a sitemap will ensure it see's the search engine.
But, remember just because you send in a stiemap doesn't mean it will do well gathering search engine traffic as you still might have higher competition.