As of this morning Typhoon Lagoon is showing posted operating hours through January 7 2026. As far as I understand though it's technically subject to change, so we won't know for sure until it's closer to January and/or they announce Blizzard Beach's reopening date.
I'm hoping to go to Typhoon Lagoon that first week of January so personally keeping my fingers crossed that that first week doesn't change! Then I'll need to cross my fingers for a warmish enough day!