Hadrat Mirza Ghulam Ahmad(as)'s advent is mentioned twice in the Quran. I will show the places where:
[62:3]
ہُوَ الَّذِیۡ بَعَثَ فِی الۡاُمِّیّٖنَ رَسُوۡلًا مِّنۡہُمۡ یَتۡلُوۡا عَلَیۡہِمۡ اٰیٰتِہٖ وَ یُزَکِّیۡہِمۡ وَ یُعَلِّمُہُمُ الۡکِتٰبَ وَ الۡحِکۡمَۃَ ٭ وَ اِنۡ کَانُوۡا مِنۡ قَبۡلُ لَفِیۡ ضَلٰلٍ مُّبِیۡنٍ ۙ﴿۳﴾
ENGLISH
He it is Who has raised among the Unlettered people a Messenger from among themselves who recites unto them His Signs, and purifies them, and teaches them the Book and wisdom, although they had been, before, in manifest misguidance;
[62:4]
وَّ اٰخَرِیۡنَ مِنۡہُمۡ لَمَّا یَلۡحَقُوۡا بِہِمۡ ؕ وَ ہُوَ الۡعَزِیۡزُ الۡحَکِیۡمُ ﴿۴﴾
ENGLISH
And among others from among them who have not yet joined them. He is the Mighty, the Wise.
Now when this ayah was revealed the Sahaba asked who these people were, and Muhammad(saw) explained the ayah:
حَدَّثَنَا عَلِيُّ بْنِ حُجْرٍ، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ جَعْفَرٍ، حَدَّثَنِي ثَوْرُ بْنُ زَيْدٍ الدِّيلِيُّ، عَنْ أَبِي الْغَيْثِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ كُنَّا عِنْدَ رَسُولِ اللَّهِ صلى الله عليه وسلم حِينَ أُنْزِلَتْ سُورَةُ الْجُمُعَةِ فَتَلاَهَا فَلَمَّا بَلَغَ : ( وآخَرِينَ مِنْهُمْ لَمَّا يَلْحَقُوا بِهِمْ ) قَالَ لَهُ رَجُلٌ يَا رَسُولَ اللَّهِ مَنْ هَؤُلاَءِ الَّذِينَ لَمْ يَلْحَقُوا بِنَا فَلَمْ يُكَلِّمْهُ قَالَ وَسَلْمَانُ الْفَارِسِيُّ فِينَا قَالَ فَوَضَعَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَدَهُ عَلَى سَلْمَانَ فَقَالَ " وَالَّذِي نَفْسِي بِيَدِهِ لَوْ كَانَ الإِيمَانُ بِالثُّرَيَّا لَتَنَاوَلَهُ رِجَالٌ مِنْ هَؤُلاَءِ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ وَقَدْ رُوِيَ هَذَا الْحَدِيثُ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صلى الله عليه وسلم مِنْ غَيْرِ وَجْهٍ . وَعَبْدُ اللَّهِ بْنُ جَعْفَرٍ هُوَ وَالِدُ عَلِيِّ بْنِ الْمَدِينِيِّ ضَعَّفَهُ يَحْيَى بْنُ مَعِينٍ . ثَوْرُ بْنُ زَيْدٍ مَدَنِيٌّ وَثَوْرُ بْنُ يَزِيدَ شَامِيٌّ وَأَبُو الْغَيْثِ اسْمُهُ سَالِمٌ مَوْلَى عَبْدِ اللَّهِ بْنِ مُطِيعٍ مَدَنِيٌّ ثِقَةٌ .
Abu Hurairah said: “We were with the Messenger of Allah when Surat Al-Jumuah was revealed, so he recited it until he reached: And other among them who have not yet joined them, A man said to him: ‘O Messenger of Allah! Who are these people who have not yet joined us?’ But he did not say anything to him.” He said: “Salman [Al-Farsi] was among us.” He said: “So the Messenger of Allah placed his hand upon Salman and said: ‘By the One in whose Hand is my soul! If faith were on Pleiades then men among these people would reach it.”’ (Jami` at-Tirmidhi Vol. 5, Book 44, Hadith 3310)
And:
[9:33]
ہُوَ الَّذِیۡۤ اَرۡسَلَ رَسُوۡلَہٗ بِالۡہُدٰی وَ دِیۡنِ الۡحَقِّ لِیُظۡہِرَہٗ عَلَی الدِّیۡنِ کُلِّہٖ ۙ وَ لَوۡ کَرِہَ الۡمُشۡرِکُوۡنَ ﴿۳۳﴾
ENGLISH
He it is Who sent His Messenger with guidance and the religion of truth, that He may make it prevail over every other religion, even though the idolaters may dislike it.
There are two similar versions of this ayah that are also found in the Quran:
[48:29]
ہُوَ الَّذِیۡۤ اَرۡسَلَ رَسُوۡلَہٗ بِالۡہُدٰی وَ دِیۡنِ الۡحَقِّ لِیُظۡہِرَہٗ عَلَی الدِّیۡنِ کُلِّہٖ ؕ وَ کَفٰی بِاللّٰہِ شَہِیۡدًا ﴿ؕ۲۹﴾
ENGLISH
He it is Who has sent His Messenger, with guidance and the Religion of truth, that He may make it prevail over all other religions. And sufficient is Allah as a Witness.
And:
[61:10]
ہُوَ الَّذِیۡۤ اَرۡسَلَ رَسُوۡلَہٗ بِالۡہُدٰی وَ دِیۡنِ الۡحَقِّ لِیُظۡہِرَہٗ عَلَی الدِّیۡنِ کُلِّہٖ وَ لَوۡ کَرِہَ الۡمُشۡرِکُوۡنَ ٪﴿۱۰﴾
ENGLISH
He it is Who has sent His Messenger with the guidance and the Religion of truth, that He may cause it to prevail over all religions, even if those who associate partners with God hate it.
As Hadrat Mirza Bashirudeen Mahmud Ahmad(ra) cited Abū Jaʿfar Muḥammad ibn Jarīr al-Ṭabarī's view on 9:33 as an example, let's take a look at his tafsir of this ayah:
‘The time of which this verse speaks is appointed for the coming of Isa bin Maryam [i.e. his second coming].’ Tafsir Jami al-Bayan, vol. 29.