I agree. The actual wording of the rule ("The select committee may disclose publicly such information after the expiration of a five-day period following the day on which notice of the vote to disclose is transmitted to the President") implies that on the next committee meeting following the Saturday expiration of the waiting period, they would meet, take notice of lack of objection by the President, and then vote to release the memo. So it would be Monday.
Yesterday or perhaps Monday while visiting Fox and Friends on the roof, Sarah Huckabee C. said it will be released on monday.