What is the legal ruling regarding Friday prayer in the mosque while there is no cure for the Coronavirus, and what is the ruling regarding performing it at home while the mosques are open?

Considering the aforementioned illness as an excuse to miss Friday prayer depends on the individual's health condition and the expected harm, with the ruling being for the prevalent situation. Estimating this requires consulting specialists and health authorities. If the concerned authorities open mosques with preventative advice, the general rule is that answering the call to prayer is obligatory, based on Allah's saying: "O you who have believed, when [the adhan] is called for the prayer on the day of Jumuʿah, then proceed to the remembrance of Allah." The exception remains for special cases, based on the opinion of doctors.