Vaishnava Samhita. Ganga Yamuna Charitam. Vol II Book VI Chp 4 Shlokas 22 - 23

लब्ध्वा मन्त्रोपदेशञ्च गोपीभावमवाप्य च 
सेवारहस्यं विज्ञाय कन्यके मुदमापतुः  ||
राधिकावल्लभं देवं हरिवंशकरार्चितम् 
अवलोक्यैव सानन्दं प्राप्तकामे बभूवतुः  ||

The girls attained divine joy receiving the sacred mantra from him and thereby attaining Gopi Bhava. They also learnt the secret ways of serving Shri Krishna. Having the darshan of Shri Radhavallabha, worshipped by Harivamsha they felt their desire was fulfilled and became ecstatic