Yes, you can legally play for real money on WSOP.com if you are located in New Jersey or Nevada. In Delaware, players use the 888poker platform. WSOP and 888poker combine player pools to make up the largest player network in the United States.
Also, look for WSOP to launch next in Pennsylvania in 2021. There is also a possibility that WSOP will launch where online poker is legal. For now, those states waiting in the wings are Michigan and West Virginia.