Indeed, the Tai Chu Realm does have an Emperor of Heaven, as well as a Heavenly Court, with the Emperor of Heaven being the master of that court.
This information was learned by Han Li from the Xuxian Realm.
The Tai Chu Realm is vast and boundless, and most of the powerful practitioners of the Immortal Dao reside within the Thirty-three Heavens.
Above the Thirty-three Heavens are countless Immortal Dao forces, among which there are no shortage of forces of Immortal Emperor Rank, such as the Guanghan Immortal Palace, Longhan Immortal Court, and Nine Tribulation Mountain, which Han Li has heard about.
Although the Tai Chu Realm does not have thirty-three Immortal Emperor Rank forces, it certainly has more than three. The Guanghan Immortal Palace, Longhan Immortal Court, and Nine Tribulation Mountain—these three major Immortal Emperor Rank forces—are ones Han Li has heard of by chance.