Many folks have elevated BP at the point of diagnosis of their T2. If you do some reading on Metabolic Syndrome, you will see some pointers as to why that might be.
My own BP was elevated at the outset; in fact it was my BP that triggered my blood tests, leading to diagnosis. However, once I got my diet in hand and trimmed a bit of weight, my BP also came into normal ranges and has stayed there. I do have dreadful White Coat Syndrome too, so a home monitor helps you gain a true insight as to how elevated you might be, and whether the elevation is sustained or just in medical locations! Even though my routine BP is now excellent, I was almost rejected for surgery at the end of last year due to the readings on the day. Fortunately, I was being anaesthetised by a consultant who took a wider, pragmatic view, and got me off to sleep. It was absolutely fine post op.
I'd urge you to work on your blood numbers and trimming up if you need to. That is one way to improve your chances of keeping or getting your BP in decent range.