YOU SAID:

I've told them to kind of check it, but they'll know when it's time to get on it.

INTO JAPANESE

私は彼らにそれをチェックするように言ったが、彼らはそれに乗る時が時間を知るだろう。

BACK INTO ENGLISH

I told them to check it out, but they'll know when it's time to get on with it.

INTO JAPANESE

私は彼らにそれをチェックアウトするように言ったが、彼らはそれに乗る時が時間を知るだろう。

BACK INTO ENGLISH

I told them to check it out, but they'll know when it's time to get on with it.