Why hasn’t Jesus come in our day and in our age? God is waiting for more people to be saved. Peter tells us that many will ask,

4“…‘Where is the promise of his coming? for since the fathers fell asleep, all things continue as they were from the beginning of the creation.’ 5For this they willingly are ignorant [of it]. 8But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day. 9The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.” 2 Peter 3:4-5, 8-9

It could be that the reason Jesus didn’t come yesterday is because God wants you to be saved today. It could be that God is keeping the door open just one more time.
But I tell you, in Noah’s day the flood did come. And even now the raging waters of God’s wrath are furiously pounding against the dam of His mercy.
One of these days Jesus Christ will come, and it will be too late for you as it was too late in that day—the flood did come, and the day of the Lord will come. “As it was in the days of Noah…,” so shall it be in this day.
LWF.org