Of Or On? (I will keep you posted of/on the progress)

English as a Second Language English Vocabulary, Grammar and Idioms
1

hi there. just want to confirm which is correct.

I will keep you posted of the progress

I will keep you posted on the progress

Thanks.

2

BYU-BNC: BRITISH NATIONAL CORPUS
on -2
of -0
CORPUS OF CONTEMPORARY AMERICAN ENGLISH
on - 59
of -1

“On” is probably correct.