A UN Security Council resolution drafted by US diplomats will order Syria to comply with an April 10 deadline to halt the fighting and withdraw its forces from towns and cities.
The text is expected to be adopted by Thursday evening.
President Bashar Assad has vowed to comply with a peace plan crafted by special envoy Kofi Annan.
But the violence continues.
Activists said that at least 41 people were killed in the city of Homs on Wednesday.
The International Committee of the Red Cross has long called for a daily two-hour humanitarian truce to deliver aid.
Its chief Jakob Kellenberger was in Deraa on Wednesday to assess the humanitarian needs in the birthplace of Syria’s year-long uprising.
The truce features in Kofi Annan’s six-point plan to solve the crisis.
An advance team from the U.N. peacekeeping department is expected in Damascus within the next 24-hours to discuss deployment of observers to monitor a ceasefire in Syria.
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