Really
As Was Expected, Just As I Thought, As Expected
adverb
So this doesn't really make much sense in terms of the kanji and word, but it is what it is. Let's remember it this way:
The kanji is fruit so the meaning is really? Like, really really? Because it sounds like you made that up. I really doubt it means really.
It can also mean as was expected or just as I thought, but usually we use it as a way to say, "Really? I don't really believe you..."
When you don't really believe someone, you say, "Hah (は)! Nice try, but you're not fooling anyone." As was expected, you saw right through their lies. Hah!
果たしてこの計画は成功するのだろうか？
Will this plan really succeed?
私の行動は果たしてあれで正しかったのだろうか？
Was my action really the right thing to do?
あのカフェでコウイチに会えるかもしれないと思っていたら、果たしてその通りになった。
I thought I might be able to meet Koichi at the cafe, and sure enough, I did.