I agree that a banner, too, could be useful in such cases. I do, however, find it more important to include such info in the mail one receives after submission where a timeframe of said 10 days explicitly gets mentioned. To my knowledge, nowhere in the console does it give any information about how long the review process needs, meaning there’s also nothing (besides, perhaps, personal experience) that would suggest shorter review times. In the mail (which all developers get), however an expectation of that time is given, meaning this is the place where such a notice is crucial.
Of course, a banner would also be helpful, but the place where I think this information is actually necessary is the mail (also, because this is a document one, hopefully, retains with which one could contact Adobe staff stating “in this email, you’ve specified time X. I’ve not heard of you since and would like to know why”, while a banner may not be visible when searching for reasons for a slow response).