Gov. Phil Murphy is expected to sign six gun control bills passed by the state Legislature Thursday.
The governor would not signal whether he would sign the bill - or even when he might decide.
"Governor Murphy looks forward to closely reviewing the sports-betting legislation that was recently passed by the Legislature", said Murphy spokesman Dan Bryan.
Dermot Smurfit, chief executive of GAN, said: "Online sports betting "go-live" preparations are well advanced and we remain confident in launching as soon as reasonably possible in H2". Monmouth Park in Oceanport, near the Jersey shore, has been particularly vocal about wanting to start taking sports bets on Friday, hoping to capitalize on a big weekend of horse racing that is likely to flood the struggling track with cash-laden gamblers.
Atlantic City casinos, along with other racetracks around the state, also are preparing to begin taking bets quickly, both in-person and online, as soon as their sports betting rooms are prepared. Borgata and MGM officials would not comment on the sports betting legislation as it affects the company's basketball team.
Betting lines at Dover are supplied by William Hill, the Delaware Lottery's vendor for sports betting.
New Jersey lawmakers are rethinking a law that would have banned one Atlantic City casino from offering sports betting.
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The bill contains none of the fraud-fighting measures requested by professional sports leagues, including real-time game data sharing with casinos and state regulators, as well as fees to the leagues to help pay for expanded monitoring and investigations.
Thursday's unexpected development is the latest chapter in New Jersey's seven-year fight to legalize sports betting.
Monmouth Park, for its part, had said that it had hoped to open sports wagering on Friday, should the governor sign the bill in the short term.
Arizona would receive $35.8 million to $178.9 million in taxes from sports betting by 2023, according to a 2017 report from Las Vegas-based Global Market Advisors.
Three casinos in DE started accepting sports wagers this week.
The bill would allow Atlantic City casinos and racetracks, including Monmouth, the Meadowlands and Freehold Raceway, to offer sports betting. The 1.25 percent add-on fee for tracks would be split among the host community and the county in which the track operates. Now, any state is free to adopt laws legalizing it, and analysts expect most to do so. Internet bets, which will be legal 30 days after the law is signed, will be taxed at 13 percent. The track has loudly wanted to begin taking bets Friday.
It will do likewise at Tioga Downs Racetrack in NY.
A last-minute change allowed the Golden Nugget to take sports bets, despite the fact that its owner, Texas Billionaire Tilman Fertitta, also owns the NBA's Houston Rockets.