Asking for "Cornerstone Content" Page Advice

I'm writing a 7 part series of posts and will have a page to cement them together, where readers can read about the subject and then go into each post.

Would it be best for SEO purposes to have all 7 posts written and published before publishing the page, or is it ok to add each post as they're published?

The first one is set to go live tomorrow, and it's WordPress I work in. Thanks for any advice!