I have the similar timelines. I have received the biometrics and medical examination request. But no confirmation letter for approval of sponsorship.I have the same situation. decision made on sponsorship, didn't received any notification;
recently received received bio, IME request. see my process just under your post.
I assume you will receive bio and IME requests soon!![]()
Let's see, I have raised a IRCC webform query asking for the letter.