IF/AND Logic

I've been trying to figure out this logic for some time, and would love some help. I attached the sheet below with a simple example.

The first highlighted cell should return the first date, after today, that is over 90%. This would be 5/18.
The lower highlighted cell should return the first date, after the date above, that the percentage is under 90% again. This would be 6/22.

The percentages are variable, and can change from week to week.
Thanks ahead of time!