来てるよ

is here

→ 来る
phrase Rare #20,886
is here Informal contraction of 来ているよ. Used to tell someone that a person or vehicle has arrived or is already here.
JA: 友だちがもう来てるよ。
EN: Our friend is already here.

電車はもう来てるよ

The train is already here.

電車が来てるよ

The train is coming.

ナンシーあなたに手紙が来てるよ

Nancy, you've got a letter.

だれか玄関に来てるよ

Someone's at the door.

来てるよ

I'm coming!

— 魔女の宅急便 (1989)

ここは前にも来てるよ

I've been here before.

— ロード・オブ・ザ・リング/二つの塔 (2002)

誰か玄関に来てるよ

Someone’s at the door.

しょーちゃんゆづちゃん上に来てるよ

Sho-chan and Yuzu-chan are upstairs.

— 映画 聲の形 (2016)

二人とも来てるよ

They're both here.

列車はもう来てるよ

The train is already here.