I don't take any medication for my T2. My a1c is 5.9
I do weights 3 times a week, walk my dog late in afternoon for around 50mins and some light bike peddling on an exercise bike between meals. I eat 3 times a day, on a weights day I'll eat a small snack post workout, but nothing major. It's a routine, it's an effective way to decrease insulin resistance. Which should be your goal.
You don't need to go ballistic every workout, just get into a routine. I do my weights about 1 - 2 hrs post meal, depending on how I feel. There is enough food (Protein and carb content) to support a workout in that meal before weights. You don't need to load up on protein powders.
My routines are about 40 mins in duration. I do increase protein and carb intake around the workout... remembering protein also raises bg levels, but that's to allow for the workout and also to partly support post workout because I don't want to be hungry at a time when I've already eaten only 2 to 3 hrs earlier.
Exercise is a great tool for decreasing insulin resistance, but when used with diabetic drugs you will have to be careful to avoid hypos. So monitoring levels will be important until you get into a steady routine and things settle down. If you get it right, takes some time, then yeah, you could well be off metformin.