Most important thing is to observe how well you stick to this plan and if weight is coming on at a reasonable rate and strength is increasing. Then make adjustments based on what you see.
I probably wouldn’t down a half gallon of milk at 7pm unless you hate sleeping lol
I would also consider some variety, that plan would drive me nuts. Getting a range of veggies and fats is important - if you cant mix your fat sources up then look into supplementing with fish oil.
If you don’t like oats just have some weetabix or toast or similar
If you haven’t eaten like this before, you may want to transition to the larger quantities rather than going whole hog and feeling bloated for a month.