Let us talk about the rate of return curve.
That slope is quite steep. Because of that, you will have a more extreme difference, historically speaking, between the overnight rate and the mortgage rate. Plus, the cost of borrowing of the institutions is a little higher in terms of the spread than you would have historically.
But your question is a fundamental one: how does it look in terms of the extremes? The easiest way to answer that is to provide the information you just asked for.