The pair made contact in a heated exchange on Sunday during the fourth day's play. Australia won the match by 218 runs on Monday.
The pair had both pleaded not guilty to the charge in a hearing.
Match referee Jeff Crowe was deliberating and was expected to hand down his decision within 24 hours.
The maximum penalty for a breach of the ICC's contact rule is a ban of one test and/or a fine of their entire match fee.