Indeed, the Hour is coming - I almost conceal it - so (20:15)

Almuntakhab Fi Tafsir Alquran Alkarim

The predetermined Eventful Hour shall inevitably come to pass, I almost keep it from the knowledge of others so that each soul be requited with what is commensurate with its deeds

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(20:15) The Hour of Resurrection is sure to come, but it is My will to keep the time of its coming secret so that every soul may be recompensed according to its labours. *10

Indeed, the Hour is coming - I almost conceal it - so meaning

*10) After Tauhid the second thing that was revealed to alI the Prophets was the reality of the "Hereafter", and they were appointed to impart its knowledge to their peoples. Here its object Gas also been stated. The Hour of Resurrection is destined to come so that every one should get the recompense in the Hereafter of what one did in this world, and that Hour has been kept secret to fulfil the requirement of the trial. For the one who believes in the Hereafter will always be on his guard against any deviation from the Right Way, and the one who does not believe in the coming of that Hour will remain engaged in other things, for he will think that he did not see any sign of the coming of the Hour.
 

Indeed, the Hour is coming - I almost conceal it - so meaning in Urdu

قیامت کی گھڑی ضرور آنے والی ہے میں اُس کا وقت مخفی رکھنا چاہتا ہوں، تاکہ ہر متنفّس اپنی سعی کے مطابق بدلہ پائے