Can you please advise how does a husband lead jamaat Salah for his wife?
How much does the wife listen and how much does she recite herself?

Yes he can lead the prayer. This is the sunnah of Rasul saw
Make niyat of jamat and listen the qirat of two surahs of first two rakat in zohr asr pay attention in meaning of surah or read zikr like subhan Allah and rest you have to read like jamat prayer