Actually, I do think they might notice eventually. Still, it sounds like you could have a reasonable case for working from home a few days a week. If you wanted to do that.

Is it good or bad that this happened at the same time as you're going through chemo and radiation?

It's good. Chemo depresses your white blood count, so it gives any nasty bugs already in your system an invitation on a silver platter to come wreak havoc. So the doctors tell you to go ahead and have any dental work you've been neglecting done before you start chemo.