Does -delete delete all files in the directory at time of execution or only files downloaded

Hello,
I have a high transaction/file count FTP server that I need to connect to, download files and delete just the files I have downloaded.

Calling from the command line does the -delete only delete what has been downloaded in that connection or does it perform a global delete on the currently connected folder?

Thanks

"What has been downloaded in that connection" only, of course.
See https://winscp.net/eng/docs/scriptcommand_get#delete