[1817] i.e., when they are gathered to witness concerning their nations. The sentence's conclusion is understood to be "...the promised judgement will then take place."
Verse 11 of Surah Al-Mursalat (77:11), a Meccan surah, is in juz 29, on page 580 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 73 reciters.
Listen to verse 11 of Surah Al-Mursalat
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Tafsir of verse 11
Al-Mukhtasar
And the Messengers will be gathered for a fixed time.
[Be warned of] the Day when Allāh will assemble the messengers and say, "What was the response you received?" They will say, "We have no knowledge. Indeed, it is You who is Knower of the unseen" -
And the earth will shine with the light of its Lord, and the record [of deeds] will be placed, and the prophets and the witnesses will be brought, and it will be judged between them in truth, and they will not be wronged.