How to update "updated_at" column automaticly when related row is updated?

Hello. I'm using PostgreSQL as a dbms. So driver is pg. I want to update the "updated_at" column when the row is updated. Is this implementation is ok for the feature.
const updated_at = timestamp("updated_at")
.notNull()
.defaultNow()
.$onUpdateFn(() => sql`now()`);
const updated_at = timestamp("updated_at")
.notNull()
.defaultNow()
.$onUpdateFn(() => sql`now()`);