"Hey the US government,
I'm an important person for the US!"
Yesterday, about six months after submission, my application was approved! Yay!
But, there is a problem... The number of green cards which can be issued in my category is limited, so I'm on the waiting list. No one cannot tell how long it'll take, but I might have to wait for a few years. Until a couple of month ago, cases in my category didn't have such a problem. I'm unlucky. Sigh...
Anyway, now I can stay and work here legally without a visa. I will just have to wait.