No, the scripting does not support parallel transfers.
But see Automating transfers or synchronization in parallel connections over SFTP/FTP protocol.

Good day! Is it possible to transfer multiple files at the same time using the get command ?
My problem is that I need to receive hundreds of small files in a short time, literally 10 bytes each.

And if you just do it with the get command, then the files are transferred one by one.