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Actual Alien life that has the advancements to get to Earth would be known because we would like like cave dweller to them. >>
Between the size of the galaxy, the age of galaxy, and the absolute speed of light, it's a lot more than mere technological advances, it's extremely unlikely that if they even exist, and exist within our tiny little blip of time, some spacefaring intelligence would even know of our existence in our tiny little 120 light year "radio bubble" of space.
Or exist within our tiny little blip of time. Thousands of galaxy-spanning empires could have come and gone without knowledge of each other in the nearly 14 billion year age of the Milky Way.
But even if such a lifeform did exist in a relatively nearby star system (less than 120 light years away), and even if they could travel at some fantastic percentage of lightspeed -- say, above 1% -- they would have to spend anywhere from many decades to centuries to get here.