Don't overlook the obvious here, friends. With God, one day is as good as a thousand years, a thousand years as a day.
God isn't late with his promise as some measure lateness. He is restraining himself on account of you, holding back the End because he doesn't want anyone lost. He's giving everyone space and time to change.
But when the Day of God's Judgment does come, it will be unannounced, like a thief. The sky will collapse with a thunderous bang, everything disintegrating in a huge conflagration, earth and all its works exposed to the scrutiny of Judgment.