يوم نحشر المتقين الى الرحمن وفدا
Some of the ulama mention that on the Last Day, when people are resurrected , a person will greet the pious man with a beautiful face and smell. The pious man will ask, who are you? The beautiful man will reply, I am your good deeds; I rode on you in the dunya and now you will ride on me in the Aakhirah. The pious man will climb on the back of this beautiful man, who is his good deeds, and he will take him all the way to Jannah.
The scholars have said that people will either be walking on their faces, normally on their feet or those that never touch the ground! They are on mounts and carried from one stage of the aakhirah to the next!
So, وفدا here means on mounts.
Ali (ra) said that they will be on mounts unseen and mounts covered in gold until they knock on the gates of Jannah.
May Allah make us from those that are on mounts in the Aakhirah!!