There is NOTHING on NJ.gov that limits filing paperwork to April orders...:
A letter issued by the NJBPU Secretary’s Office provides details on this action, giving applicants sufficient time to accept delivery of their vehicle and complete the purchase and lease paperwork for vehicles ordered within the eligibility window (July 25, 2022 through 9:00 p.m. ET on April 17, 2023) while still accommodating any delays due to supply chain disruptions. Dealerships and showrooms will be required to enter all eligible orders as described in the updated Terms and Conditions. The program administrator will accept and review all applications with an eligible vehicle order, purchase, or lease date within the eligibility window.
A letter issued by the NJBPU Secretary’s Office provides details on this action, giving applicants sufficient time to accept delivery of their vehicle and complete the purchase and lease paperwork for vehicles ordered within the eligibility window (July 25, 2022 through 9:00 p.m. ET on April 17, 2023) while still accommodating any delays due to supply chain disruptions. Dealerships and showrooms will be required to enter all eligible orders as described in the updated Terms and Conditions. The program administrator will accept and review all applications with an eligible vehicle order, purchase, or lease date within the eligibility window.