وَأَرْبَعًا قَبْلَ الظُّهْرِ، وَرَكْعَتَيْنِ بَعْدَهَا،
Translation: And four rakahs before Zuhr and two after it.
The four rakahs before Zuhr are among the emphasized regular Sunnahs; their performance as a four-rakah unit is described here. Two Sunnah rakahs follow the Zuhr fard.
If the congregation begins before the prior Sunnah has been offered, the fard is joined first. Jurists provide separate details for performing the missed pre-Zuhr Sunnah afterward.