After about 9 years learning piano as a kid I had one year of tuition from a concert pianist when I went to University.
He was an excellent teacher - one of the things he majored on was ‘blind’ familiarity with the keyboard. He would get you to close your eyes, then ask you to pick out, for example, all the Cs on the keyboard going up the octaves. Made a huge difference to my confidence in positioning my hands at speed…