The Nigerian national collation centre in the capital, Abuja, has yet to start announcing results this morning, local media reported.
Electoral officials says there are five states now ready to announce – but they will wait until 13:00 GMT (14:00 local time) to allow for more results to be ready.
On Monday, results were released from 14 of the country’s 36 states.
Ruling APC party candidate Bola Tinubu is leading with just over 44% of the tallied votes. His main rival Atiku Abubakar from the PDP has almost 33% of the vote.
Labour Party’s Peter Obi has close to 18%, having caused an upset by defeating Mr Tinubu in the biggest city, Lagos.