EU ambassadors have agreed to delay Brexit, but will not make a decision on a new deadline date until next week.
The European Commission said work on this would "continue in the coming days".
The talks came after Chancellor Sajid Javid admitted the government's deadline to deliver Brexit next Thursday "can't be met".
Boris Johnson said he was waiting for the EU to decide "what they want to do".
MPs are expected on Monday to consider the prime minister's call for an early general election.
UK Prime Minister Boris Johnson will scrap the vote on his Brexit deal—the Withdrawal Agreement Bill (WAB)—and push for a snap general election, if his program motion is voted down by lawmakers later.
If Parliament "gets its way and decides to delay everything," Johnson told the Commons, "the bill will have to be pulled and we will have to go forward... to a general election."
"I will in no way allow months more of this," Johnson added.
The program motion has come under attack for asking MPs to consider Johnson's Brexit deal in just three days.
The Commons Speaker has refused a government request to hold a "yes" or "no" vote on its Brexit deal.
John Bercow said a motion on the deal had already been brought before MPs on Saturday, and it would be "repetitive and disorderly" to debate it again.
Saturday's sitting saw an amended motion nodded through by MPs, which withholds approval of Boris Johnson's deal until it has been passed into law.
The PM agreed a deal with the EU last week, but it must be approved by MPs.
The government of UK Prime Minister Boris Johnson has set out "ambitious" policies on crime, health, the environment and Brexit in a Queen's Speech that opposition parties have dismissed as an "election manifesto".
Plans for tougher sentences for violent offenders and legal targets for cutting plastic pollution are among 26 bills set out at Parliament's State Opening.
But with the PM having no majority, many of the bills may not become law.
Boris Johnson has resigned as foreign secretary, becoming the third minister in 24 hours to walk out of the government rather than back Theresa May’s plans for a soft Brexit.
The prime minister hammered out a compromise with her deeply divided cabinet in an all-day meeting at Chequers on Friday, but after consulting friends and allies, Johnson decided he could not promote the deal.