2 Thessalonians 2 explicitly tells of when the Return of the Messiah will be and it is not to save anyone before the tribulation.
When that specific number is reached, when that last person is saved, then we are out of here, all gone home to be with our LORD. That is those that have accepted His free offer of Grace per Paul. That is a day I am waiting for. Our Blessed Hope. The appearance of our LORD and Savior, Jesus Christ.