Like some, are you dull of hearing? Listen to Jesus, not men's doctrines.
What do words like 'watch' and 'Signs' mean to you in English? It's simple, Jesus 'commanded' us to WATCH. Well watch what you ask? What do you think He was telling us in His Olivet discourse about His future return?
Matt 24:42-47
42 Watch therefore: for ye know not what hour your Lord doth come.
Did He really need to spoon-feed us tell us to 'watch' the Signs He just gave prior in that Chapter? It ought to be obvious what He was telling us to 'watch'. And the very last Sign He gave in His Olivet discourse there was the event of His future return and gathering of His Church.
43 But know this, that if the goodman of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up.
There in that underlined part Jesus even revealed that the "goodman" should know In What WATCH the thief would come. Jesus was referring to the idea of the night watchman, and the division of watches of the night, using that as a metaphor for His command for us to 'watch' (the Signs He gave).
44 Therefore be ye also ready: for in such an hour as ye think not the Son of man cometh.
45 Who then is a faithful and wise servant, whom his lord hath made ruler over his household, to give them meat in due season?
46 Blessed is that servant, whom his lord when he cometh shall find so doing.
47 Verily I say unto you, That he shall make him ruler over all his goods.
KJV
Lord Jesus NEVER said the idea there that 'just because no man can know the day or hour of His coming', that it is not possible to 'watch'. He said just the opposite, that IF we are not 'watching', His coming will take us by surprise, like it will upon the deceived and wicked. They definitely aren't watching the Signs He gave.
The Signs Jesus gave there in Matthew 24 parallel the events of the Seals of Rev.6. That should... tell you a lot. And in Rev.11, when God's two witnesses are killed and left dead in the street of Jerusalem, and then rise after three days and a half, and then the 7th Trumpet sounds, that ought to tell you something about Jesus' command for us to be 'watching' too!