Should the disk.file.copyto method return information about the copied file (ID) before the file is copied?

Question

Bitrix24

In the PHP handler, the following code:

$url = ' https://**********/disk.file.copyto ';
$arFields = ['id' => $FILE_ID[$i], 'targetFolderId' => $FOLDER_ID];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'PHP/' . phpversion());
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($arFields));
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

$response = curl_exec($ch);
$result = json_decode($response, true);

$result should return information about the copied file (including its ID). Please tell me, if a large file is copied within a few seconds - the answer in $result containing the ID of the copied file should come before the copy operation is completed, or only after the file is copied?