If I'm standing to do upper body work, am I also working my legs (specifically calves)? Thank you.
The lower body muscles will be very slightly active in order to maintain balance in any standing exercise, however the calf muscles are very strong and the calf loading involved in a standing upper body exercise will be negligible compared to the loading that would occur in a deliberate calf exercise.
In short, it's almost certainly fine, but if trying to avoid calf loading due to injury, just use pain as a guide. If and only if a standing exercise causes you calf or heel pain, then try to find a seated substitute exercise instead.
In a way, you work them isometrically if you can maintain a good “form”.
If you want to train legs, you should perform exercises that specifically target them and involves concentric and eccentric contraction. In the case of calves, you can do exercises like calves raises or even squats with tip toe at the bottom or top of your squat.