Not necessarily. It depends how you have your blog setup. I asked this question previously in another post and still have not found the answer. If your blog page is set up to be a list of all the posts, this link you're creating in your method will just go to the blog summary page, not the first post in that blog summary list.
If your main blog page is set up as a continually scrolling list of the full blog posts, then yeah, the first one will always be at the top. But this is not the answer to the question asked.