Menopause and Hysterectomy

I feel dumb for asking this question, but this is all new to me. I have endometriosis that was really only treatable through a hysterectomy in 2018 because the location of the extra tissue meant it couldn't be removed. They left in one ovary, so I do have something of a cycle. I had normal hormone levels until recently. Not sure how recent as I hadn't been to a obgyn in 3 years. But I recently went and my hormone levels had massively dropped, so I started HRT. The thing is, I don't know how i actually tell when I hit actual menopause vs. perimenopause due to not having a period. I haven't had a period since 2018, but I have a hormone cycle and for a long time had almost all the symptoms associated with periods (although the pain massively reduced) except for the actual period part. I still can tell I have something of a cycle, though far less than I used to. But how do I know when I've actually hit menopause?