Sunnah Salah while Dhuhr Jama’ah or Friday Khutbah commences
At the outset, if the time for congregational dhuhr salah or khutba for Jumuah has drawn closer, then one should not start his sunnah salah. This will depend on one’s discretion such that if he were to start the sunnah salah, one is considerably sure that he will not be able to complete these sunnans in time. In such cases, he should delay them until after the congregation.
However, if one has begun performing the Sunnah salah, and while one is praying, the congregation stands or the Imam ascends for the khutba (the arabic one and not the pre-hkutba talk), then the following detail should be kept in mind.