how advanced are they now?

If extraterrestrials have visited Earth since the start of recorded history, and looking at how much our civilization has advanced since then, how advanced are they now?


And just an I idea, have we ever had legit physical evidence of an alien? what if there has never been aliens, just people from our future traveling in time on a silver disc?

the oldest recorded sighting may have predate the age of modern man, here's link to Hunan Province, China sightings dated 47,000 years ago. i say, they had a good head start tech wise, and we can only imagine how advance they are now.
and for the legit physical evidence of alien? you should spend some time browsing ATS and you will find your answer
time travel, ah that's another story...