﴿ وَأُخْرَىٰ لَمْ تَقْدِرُوا۟ عَلَيْهَا قَدْ أَحَاطَ ٱللَّهُ بِهَا ۚ وَكَانَ ٱللَّهُ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرًۭا ﴾

“And there are yet other [gains] which are still beyond your grasp, [but] which God has already encompassed [for you]: for God has the power to will anything.”

and others wa-ukhrā is an adjectival qualification of the implied subject maghānima ‘spoils’ which you were not able to capture — namely spoils from the Persians and the Byzantines; God has verily encompassed these already that is to say He knows that they will be yours. And God has power over all things that is to say He is ever possessed of such an attribute.