https://www.techradar.com/news/google-pixel-3-xl-tipped-to-be-very-big-and-packing-a-notch

It looks like the Pixel 3 XL could be both bigger and notchier than the Pixel 2 XL, as according to the latest leak it will be around 6.2 inches (up from 6.0 inches for the Pixel 2 XL) and will have a notch.

That’s according to @OnLeaks, who is a reputable leaker, so it could well be true. But if it has a notch then there’s every chance that it will achieve that size without being any bigger overall than the 157.9 x 76.7 x 7.9mm Pixel 2 XL.