as soon as
This expression indicates that something will happen as soon as a certain condition is met.
Examples
準備ができ次第、出発します。
We will depart as soon as we are ready.
駅に着き次第、電話します。
I will call you as soon as I arrive at the station.
結果がわかり次第、知らせます。
I will inform you as soon as I know the results.
Quick check
準備ができ___、出発します。