Rectus Diastasis Repair After Hysterectomy?

After pregnancy it takes about 6-8 weeks before the uterus shrinks back to normal size. So theoretically you would have your tummy tuck when you are 2 months out from your c-section without any issues. In general though you probably have some more weight to shed off and it you wait you will likely have a better result than if you were to have your surgery done when you are 2 months out from surgery.
I would say move forth with surgery if you feel that you are at the weight you are going to be or if you think you will not be able to shed any more weight.
Good luck.

Agree with other posts about waiting 2-3 months.
Here's another suggestion: as soon as your Ob-Gyn releases you, start doing abdominal exercises. This strengthens your abdominal muscles, but more importantly, makes the muscle closure more secure, and the recovery faster.
Be sure to ask for a pain pump, it will make your recovery that much easier. I have attached below a link to a blogpost on pain pumps and how they improve recovery.

The changes that occur in your body during a nine month pregnancy and C-section are very significant. It takes several months for your body to return to normal.Although it may be safe to have a diastasis repair 3 months after your pregnancy I believe that your body will be more likely to be closer to normal not sooner than 6 months after the pregnancy.The closer you are to your normal physical shape, the better your results will be.See before and after photos of tummy tuck.