There have been far too many nuisances of late, far too many thinly veiled dangers for Zod's liking. Therefore, after months of uncertainty and worry, actually being able to take action against one of said nuisances is, in his mind, something of an improvement. It's certainly preferable to waiting for harm to befall his people or anyone else involved.

That said, their plan isn't without its risks. Even with the Major keeping an extremely close watch, he's a bit on edge about the situation, to say the least. And waiting for their guest to show up is not an enjoyable experience.

So he'll just sit, thinking through each precaution being taken. He knows that everything is in place, but mentally double checking himself is about the only thing he has to keep himself occupied at the moment.