N.J. Stat. § 5:5-85
The conduct of the parimutuel system of wagering at horse race meetings on the days upon which such meetings are conducted is authorized and shall be lawful between the hours of 8 a.m. and 1 a.m. the following day on Mondays through Saturdays and between 12 noon and 1 a.m. the following day on Sundays at horse race meetings held on Sunday pursuant to section 1 of P.L. 1966, c.206 (C.5:5-84), including wagering at any horse race meeting upon the result of any and all horse races held at such meeting when such wagering is during the hours when wagering is permitted pursuant to this act and prior to the conduct of any race held at said meeting, in the same manner and to the same extent as the parimutuel system of wagering is now authorized.
N.J.S. § 5:5-85