I hope so - here are the full terms and conditions, and they don't mention anything about that topic; I have a stay planned for Thanksgiving and plan to register just before that stay in order to maximize the benefit:

You must be a World of Hyatt member, have received this offer from Hyatt, and register to participate. Only Eligible Stays completed 90 days after registration (“Promotion Period”) will count towards this promotion. You will receive triple points per Eligible Stay of two (2) or more consecutive Eligible Nights at Hyatt hotels and resorts worldwide. A maximum of 30,000 Bonus Points may be earned under this promotion. All points awarded under this promotion are Bonus Points. For the purpose of this promotion, an “Eligible Stay” is defined as any stay where a member is paying an Eligible Rate or redeems a free night award. Only the room occupied by the member will count toward this promotion. You must provide your World of Hyatt membership number before the time of checkout for each stay. Please allow two to three weeks after checkout for Bonus Points to be posted to your World of Hyatt account. Except as expressly stated, this promotion is not valid with other offers, promotions or discounts and is non-transferable. This promotion may be altered or withdrawn at any time and, where required, an alternate offer of similar value will be offered. Void where prohibited by law. This promotion is subject to the terms and conditions of the World of Hyatt program available at hyatt.com/terms. Hyatt®, World of Hyatt®, and related marks are trademarks of Hyatt Corporation or its affiliates. ©2024 Hyatt Corporation. All rights reserved.