できたよ

it's done

→ 出来る
phrase Uncommon #17,298
it's done Informal expression used to announce that something has been completed or is ready. Depending on context, it can also mean “I did it.” The よ adds emphasis or indicates that the speaker is informing the listener.
JA: やっと宿題ができたよ。
EN: I finally finished my homework.

朝ごはんできたよ

Breakfast is ready.

新しい彼女ができたよ知らなかった

I have a new girlfriend. Didn’t you know?

女性できたよ

I did it!

— 紅の豚 (1992)

トムそれできたよ

Tom got it done.

準備ができたよ

I'm ready.

— 8 1/2 (1963)

さあできたよ

There, it's done.

— 千と千尋の神隠し (2001)

ご飯できたよ

Dinner's ready.

— タクシー運転手 約束は海を越えて (2017)

はーいできたよ

(Megumi): There you go, it's done.

— バトル・ロワイアル (2000)

お昼ご飯できたよ

Lunch is ready.

できたよ

I did it!

— イル・ポスティーノ (1994)

できたよ

(Osamu) You got it done, right?

— 万引き家族 (2018)

なんとか時間内に到着できたよ

I managed to arrive on time.

勉強よくできたよ

You did well in your studies too.

— オールド・ボーイ (2003)