Severe Diastasis Recti Repair with Vertical Incision and Mesh Also Repair of Ventral Hernia? (photo)

It is difficult to tell from your photos exactly how much of your abdominal protuberance is from diastasis rectus and how much is being contributed by your ventral hernia. Either way, you should have both corrected for an optional contour. Further, you will likely need vertical and horizontal incisions in a Fleur-de-Lis pattern.

i would recommend that you see a plastic surgeon who can do both the hernia and the diastasis repair with the tummy tuck .

It is hard to answer your question without more info--like height and weight. You certainly would have some improvement, but with a vertical scar that is hard to conceal. The vertical skin excess would not be addressed, so the skin overhang will persist. 

Most plastic surgeons would favor a lower abdominal incision and would do this procedure along with a tummy tuck to trim the excess skin. The diastasis would be repaired, the hernia would be repaired (often by a second surgeon, a general surgeon), and the excess skin would be removed. 

By either approach the outcome would be better if you are close  to your ideal weight, and that I can't tell from these photos.

Thanks for your question, best wishes.