Hi there,
Congrats on your successful application cycle so far! That's a good question re: your bonus but it's honestly not worth an update in my experience. It's not going to be a deciding factor in an admit vs. reject decision. In addition, you're certainly not the only applicant who will have gotten his/her bonus in Jan/Feb so it's not a new or unusual situation
Since Kellogg allows you to easily submit an update online, you could do so there if it's going to give you peace of mind but I don't recommend submitting a manual update to your other schools. (If you got promoted as well, then that's a different matter.)
I hope that helps! Best of luck with your interviews!
Kindly,
Melody