while one is at it

пользуясь случаем (and while you're at it... VLZ_58); как раз (в знач. "заодно" • while we are at it, while I'm at it и т.д. 4uzhoj); заодно (I'm just going to clean my boots. – Well, you can clean mine too while you're at it. 4uzhoj)

while one is or was at it

génér.

попутно

while one is was at it

inform.

походя