We currently do not have interstellar capability. Therefore, any technology capable of interstellar travel must be at least somewhat more advanced than where humans currently are. Most likely, very much more advanced.
Thank about how current technology would seem to somebody from George Washington's time.
Now, this does not necessarily mean that any alien visitors will themselves be very advanced. Think about Somali pirates. They have purchased technology which they could not have developed themselves. We might encounter aliens who purchased/stole technology from more advanced aliens.
We don’t have the capability right now, but we do have the technology. Using atomic propulsion giant, naval ship sized vessels could be sent at a greater speed than with chemical rockets. It might take a hell of a long time but we could get there. In the near future, we might be able to use done sort of suspended animation to extend life on board, of it might be a multiple generation voyage.