I just recovered (mostly) from a rather debilitating sciatic nerve pinch that made it impossible for me to sit down comfortably. Fortunately, the wonders of epidural steroid injections have solved that issue for me, at least temporarily, and I'm back on my feet (and ass) and writing again.
I couldn't use my MacBook or my iMac while I was recovering. Instead, I was glued to my iPad. I even managed to "thumb-in" two chapters of the book. Short chapters, by necessity, but important ones. It's just so much easier to use a keyboard. I've returned to work and have a lot of catching up to do, but I'm getting there.
I don't think there's much chance I'll finish the book before the end of the year. Although I'm entering the end game of the story, the action is quite complicated and is going to require some careful orchestration.