Pending for a new Sitemap to be fetched by Google

After you submit a new Sitemap, it will appear in the "Submitted sitemaps" report list with the "Could'n fetch" status and no "last read" date. Don't worry about it, it's just the initial status assigned by Search Console which means your file is pending processing. After a while (usually a day or two) the status will change and the "last read" date will appear next to it.