telegram messages scraping -- 2

Job ID: 32808089

Budget: $30 – $250 USD

hello, i need a script programed with telethon and python that is constantly listing to new messages from a private channel, i only have the channel´s id(-397472xxxxx) something like that and its not possible to add a bot to the channel that is made with @botfather for example(a native telegram bot)
when a message is send on that group, that message must be store in a list with the time that has been sent and also on a csv file with two columns(time and message)