I have always taught lessons via FaceTime and Skype for students who don't live in San Antonio (Los Angeles, Houston, Nashville, Amarillo, and even on the street in NYC!) or local students for whom weekly travel into town is prohibitive to their schedule.  In fact, my own lessons are always online, as my teacher lives in Denver, CO.  Due to COVID 19, I am currently teaching ALL lessons online.  Singing has been shown to increase droplet spread to up to 16 ft, so in person lessons are definitely unsafe at this time.