There is a lot of discussion of this in Christian Thibaudeau’s forum, and he is more expert on this, so the best single thing I can recommend is to find what he has advised.
Very briefly though I’d suggest looking at it this way:
How many hours are being covered in this nutrition? I don’t know, let’s say it is 2 hours time from when you wake up to the time of the post workout whey, and another hour before the next meal. So three hours time. (I expect your actual figure will be different: this is just illustration.)
Well, even if doing nothing, aren’t you burning say 120 cal/hour just by being alive and awake? So that’s 360 calories for 3 hours.
Your workout presumably burns something. I don’t know what: maybe 500 calories? Just making up a figure there.
So this is 860 calories – oh, maybe it’s 600 or 900, but some figure like this – just to cover those three hours.
That amount would do nothing towards actually providing a surplus when the muscles can best take it up.
It would do nothing towards filling the hole (so to speak) resulting from having had nothing to eat for 8 hours or whatever while asleep.
It would just cover expenditures for those 3 hours.
Are the calories of your breakfast, your 20 g of whey during workout, and 1 scoop after workout, anything like even that 600-900 calories?
Wouldn’t it be better if what you actually took in were not only enough to cover expenditures, but to “fill the hole” and to even give some surplus for the muscles?