Turkey and the United States last month agreed on the so-called "security mechanism" to create a buffer between the Turkish border and Syrian areas controlled by the Kurdish People's Protection Units (YPG).
The YPG led the US-backed Syrian Democratic Forces (SDF) in battle against the Islamic State group in Syria, but Ankara views the Kurdish fighters as "terrorists".
The United States and Turkey launched their first joint patrol of the border areas on September 8, but Ankara has accused Washington of stalling in the week since.
A coalition delegation on Sunday visited a military council in the northern town of Tal Abyad, from which Kurdish forces started withdrawing late last month.
"We are seeing good progress for the initial phase of security mechanism activities," the coalition said in a statement handed out to journalists.
"The coalition and SDF have conducted multiple patrols to identify and remove fortifications to address concerns from Turkey," the statement said.
"Four joint US and Turkish military overflights" were also carried out, it said.
Little is known about the buffer zone's size or how it will work, although Ankara has said there would be observation posts and joint patrols.
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