If needed, you can check when a user last signed in to their account.
From the Google Admin console Home page, click Users. Under Last sign in, you'll see the approximate time of the user's last sign in, like 2 minutes ago, 1 day ago, or 2 months ago.
If a new user hasn't signed in to their account for the first time, the column shows Hasn't signed in.
Note: Data lag time from a couple of hours up to 3 days.