Should I wait to get my breasts done until after I reach my goal weight? Will losing 30 lbs mess up a breast lift?

Hello!
If you feel that you will be losing an additional 40lb, then you need to wait to embark on plastic surgery. Significant weight loss will hurt your cosmetic outcome. You need to meet your weight loss goals and allow time for your body to stabilize in your weight loss for at least 4-6 months, so you are nutritionally optimal. This includes the BBL surgery.
Your priority body region should be the first one you do. It's possible you might be able to do everything in one session. You should meet with a board certified plastic surgeon to help guide you in safely reaching your goals.
Best of luck to you!

I would suggest waiting until you have reached your goal weight before having any surgery that will be removing excess skin. You will have your best results.

Without photos or an in office exam I am unable to determine if your 30 pound overweight assertion would impact the optimal results of the surgeries. If your goal is to lose the 30 pounds prior to the surgery, do so; and maintain it for six months prior to your surgery. Losing the 30 pounds following the surgeries will negatively impact the results. You can combine the breast lift with the lipo and BBL. Would wait three to six months afterwards to schedule the TT as the results will be much tighter.