This is such a difficult question to answer. There's "typical" and then there's each individual. As a generalization, I'd say 8 lbs./month is very ambitious, but not unheard of.

As a perimenopausal women, you might more realistically expect less. People on this board could tell you about themselves and women similar to you are most likely losing anything from 1 lb./month to 2 lbs./week. And that loss could happen steadily, or you could very quickly drop 10 lbs. and then plateau for six weeks until you start gradually losing again, or it could happen in fits and starts.