New Mac Player

Hi all! I'm new here and am super excited to play vanilla WoW again! I only have one question. I downloaded the game to Mac. Clicked the WoW icon. And started playing. It was great and worked wonderfully well. My question: How do I know if I am running the right version of Nostalrius? Is there a patcher just for this server? Are updates pushed to the server automatically and I never have to update my client? Will I have to eventually delete my client and download a newer version as bugs are squashed? I hope my questions make sense. But, basically, I downloaded the game, it started, and worked super well. But when the devs here fix something, how does that get pushed to the Mac client?
Sorry if this is a super newb question.
Thanks.
Sorry if this is a super newb question.
Thanks.