Phone, I hope you got my PM.
Sorry for taking so long to answer, I'm sort of becoming like Fangio.

I don't hang around as much as I used to.
If you are "fluffy", you definitely will benefit from losing weight.
One thing that happens with organ transplants is that the anti-rejection drugs cause weight gain in a lot of folks.
For this reason, the docs want you to "thinner" to start.
I've spent years struggling with my weight.
My old man, and his mom were both diabetic.
My dad was pre-diabetic for years, with Glaucoma, for 5-10 years, before he EVER had problems with his blood sugar.
That, and the fact that I've been struggling to get around adequately due to back pain caused by my weight have caused me to make some changes.
I try to get to the gym 3-4 times a week.
My wife has gotten me a trainer. If I have someone I'm supposed to meet, I won't blow off training.
He's made me more cognizant of what I eat.
I've started paying more attention to the diets and workout info in "Men's Health" magazine. (I've been an occasional reader for years).
My trainer has also be "taking me to task".
My original goal was to be able to walk more than 100 yards without intense pain in my lower back.
I'm there, and the weight is falling off me.
The point is, when it comes to exercise, I'm fundamentally lazy.
If I can find the wherewithal to hit the gym, ANYONE can.
I haven't caught a regular season episode of NCIS for two months.

But I've lost 25+ lbs.
I can walk about a mile before I need to rest my back.
I've completed a modified "300" workout--more than once and didn't die.
If it's nothing more than taking walks with your wife, do it!
You also want to be as strong as possible for transplant surgery.
The stronger you are to begin with the better/faster your healing will be.
also, There is a link between blood sugar control and exercise.
You may be able to decrease the amount of insulin you need wth exercise.
Just remember to discuss this stuff with your doctors. And monitor your sugar 4 times a day at least. (Before meals and at bedtime)
If you want an overall pic of how your pancrease is doing generating insulin, get occasional glucose readings about 2 hours after a meal.
Your doc can glean a lot of info by having that post meal sugar.