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Whey is typically used for post workout. It digests very fast, under an hour. This is why its not best suited for bedtime use because your not going to eating for ~8 hours. But if you have no other source of protein for some reason, its better than nothing.
Try meat, eggs, or cottage cheese before bed. You could also use egg or micellar casein powder.
Your diet outline looks pretty good, but add some veggies.
And your not going to "lose belly fat and gain all around mass" it doesnt work that way. One requires a surplus of calories, the other requires a deficit. Do one then the other.
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