@Duainfey My guess is about 30 more chapters. She wants to fill the last volume, so she needs at least 100 chapters for that. I'm counting from the end of volume six, and the author did say the next volume would be the last.
We're probably going to have to wait a couple more chapters till Toda gets his own results, then some beating around the bush for the confession, then confronting the issue of telling him about the mind-reading, before moving on to the happy ending.