Here's a breakdown of what the individual parts mean:
* Ya: already
* estoy: I am
* aquí: here
* en las: in the
Here are some possible meanings depending on what the missing phrase is:
* Ya estoy aquí en las calles: I'm already here in the streets.
* Ya estoy aquí en las casas: I'm already here in the houses.
* Ya estoy aquí en las filas: I'm already here in line.
It's important to have the full context to understand the intended meaning.