“Look!” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20 (“Look!).
“proper time.”Kairos (#2540 καιρός) can mean time in the sense of “proper, right, or appropriate time” (BDAG). Much like a parent might say to a fifteen year old, “you’ll be ready to date when it is time,” or “when it’s time, we’ll know.” In these cases “time” means, the right time, the appropriate time. The Greek word for “time” was also used in this sense.