No, they don't take reservations during peak times.
Yes, you're likely going to have to wait in line for 30-45 minutes before you can get a table.
(When i was here, two stars fo the national basketball team arrived. they dutifully sat and waited until their number was called.)
BOTTOM LINE - DON'T MISS PORCAO !!!!!!
The name sounds like "poor cow", which would make sense, given the amount of beef they serve up. However, it really means "big pig" in Portuguese.
I have never seen a better churrasco in Brazil - and that's saying something!
The amazing selection of EVERYTHING will absolutyely blow your mind.
So change your schedule, cancel another dinner, add a day to your stay -- whatever!!!!
But DON'T MISS PORCAO!!!!!