Nano vapor is just a ridiculous mix of basically every possible pre-work endurance/NO supplement ever made ground to a fine powdery consistency. It won't hurt to keep taking it pre-workout, but there are much better supplements out there for the money in my opinion. I purchased Purple Wraath from Nutraplanet after trying the free samples they sent.
You might post your height, weight, age for a better response.
I think if you will see faster gains if you incorporated compound lifts like Squat, Deadlift, Shoulder Press, and Bench Press into your routine.
If your goal is simply to be able to do 50 push up at one time, then I wouldn't bother with the expense for supplements because you can easily reach that goal without any.