Mass gainer

My calorie maintenance is 2,000 cal and most of the time I only reached ranging from 1700 to 1800. Plan to take mutant mass not the extreme one.

I'd believe it's 500cal per serving (2cups). so when I reached 1800 cal + 500 cal from mutant mass that would be 2,300 in total a day.

Is that ok? I'm skinny fat. sorry for english.