A thread on today's SXS preprint: https://t.co/ry9i6UtSSG
We don't know. We know that it's been around for at least 10 billion years, and the light in our Universe has been traveling since then. Thus, if the "edge" of the Universe exists, it is at least 10 billion light-years away from us. It's possible that the Universe is bigger than that, though — maybe even infinitely large!