He aquí

He aquí
 

Hi,

The subject is very close to behold, if not equivalent. Like behold, it belongs mostly to the Bible, they say. Meanwhile, I see it almost every day, everywhere :D

From El Conjugador:

He aquí una lista de los verbos que se acerca más:

What is the real status of this expression in modern Spanish?

He aquí can also mean "here is", as in your sentence from El Conjugador.

It is used in modern Spanish, and I think it is used more often in contexts where some degree of formal language is customary, as compared to informal social settings.

I agree with Wrholt.
In a less formal construction, you may say "aquí hay" or "aquí está...".