It is imperative that we stay watchful until the tribulation occurs. Yet, the timing of that event has never been uncertain to Jehovah.
فَعِنْدَمَا كَانَ يَسُوعُ عَلَى ٱلْأَرْضِ ،‏ قَالَ :‏ « أَمَّا ذٰلِكَ ٱلْيَوْمُ وَتِلْكَ ٱلسَّاعَةُ فَلَا يَعْرِفُهُمَا أَحَدٌ ،‏ لَا مَلَائِكَةُ ٱلسَّمٰوَاتِ وَلَا ٱلِٱبْنُ ،‏ إِلَّا ٱلْآبُ وَحْدَهُ » .‏