CD13-1follicle 22mm.When will I ovulate?


I have PCOS and on Letrozole 2.5mg (brand name femara). Today June 11, 15 (CD13) was my ultrasound showing 1 follicle 22m. I have been asked to BD starting tomorrow June 12, 13 and 14.
when will I ovulate ?
How many mm does follicle grow each day ?
The days that I am been asked to BD is the right time ? OR Should I start to BD from today June 11 (CD13) till June 14 (CD16) ?

Thank you so much. I greatly appreciate all your help.