If the posts are public they will be indexable and fully SEO-friendly. It used to be important to submit sitemaps to “help” google work out the structure but in recent years it does it daily well without help. 

Here’s an example of a search showing post from a few days ago - https://www.google.com/search?source=hp&ei=4AAnXb_tG5OkyAPnyo-IDw&q=UNA10+is+available+now&oq=UNA10+is+available+now&gs_l=mobile-gws-wiz-hp.3..33i160.2709.2709..3212...1.0..0.325.325.3-1......0....2j1.......8..35i39.pnbHysAktOI

You may see that google picked up the post, picked up the video, and dedicated 3 first serps for una.io pages. It looks as good as it gets from crawling perspective. The rest would be relying on outbound links, speed and content relevance.