UN vehicles towed trailers of food into the city, and aid agencies prepared buses to transport fleeing civilians.
The current ceasefire deal is due to end late on Wednesday, but the regime has said it will allow an extension.
Hundreds were evacuated from the Old City after a truce was agreed last Friday, but more than 1,000 remain.
Red Crescent vehicles were attacked on their way to the Old City at the weekend, and their workers were briefly trapped.
Government troops have besieged Homs for 18 months.
Evacuations over the weekend were facilitated by a three-day truce, which was then extended until Wednesday.
But the operation was suspended on Tuesday because of what UN and Syrian officials said were logistical reasons.
Homs governor Talal Barazi said the temporary truce could be extended further if necessary.
UN agencies have also expressed concern over the fate of dozens of men who were taken in by Syrian security personnel after they fled Homs.
UN rights spokesman Rupert Colville said it was “essential that they do not come to any harm”.
The detainees were being held at an abandoned school, the UN said.
The Syrian authorities said the screening was necessary to weed out “terrorists”.
jdby_ebt-hoThe US House Ethics Committee has voted to release its report on former Republican Representative…
ABC News has agreed to pay $15 million to President-elect Donald Trump to settle a…
South Korea’s parliament has voted to impeach President Yoon Suk Yeol over his failed attempt…
Israeli war planes have carried out more than 100 air strikes in Syria on December…
President-elect Donald Trump has threatened to impose 100% tariffs on the BRICS countries if they…
Syrian troops have withdrawn from the city of Aleppo following an offensive by rebels opposed…