It is permissible to delay the prayer after the beginning of its time, although it is better to perform it at the beginning of its time. The time for the Dhuhr and Asr prayers is from noon time when the sun starts declining until sunset and it is not permissible to delay it after sunset.
Yes, the marriage becomes permanent. The marriage is ended by divorce which requires two Adil men to witness it. The regular waiting period of Iddah of divorce must be observed if the marriage was consummated, but if the marriage was not consummated then there would be no need to observe the Iddah.