You can see the outcome of all Poker Tournaments by going to Menu > My Account > History > Game History.
The Tournament will be logged on the Game History at the time that the first game started (i.e. when everyone has sat down and the first cards are dealt) rather than when you personally registered.
The Game History shows the basic overview (buy-in plus any win) and whether the Tournament is still ongoing. Once every player has finished and an overall winner has been declared, a green tick shows to indicate that it's complete. If a Tournament is still ongoing, you'll see a 'clock' symbol.