the problem is you can not upload XML sitemaps when using blogger, and hence not submit it either in GWT.
But by submitting the RSS feeds you should be golden... Although, since Blogger is Google owned and automatically e.g. added to Google Webmaster Tools if the accounts are associated, the point it probably pretty moot, I think you can assume Google knows and automatically detects all Blogger URLs. (I have no prove of this though, only reasoning.)