禁止发送邮件的进度

I have a view created for sending emails for events connected with the API of Mandrill, and all is working perfect, but I want to create a loading bar progress for show the real time sended emails and the total eamils sended for that event (example: X / Y: MAILS SENDED, Y: TOTAL EMAILS TO SEND) and if is possible(that I think it is) show the percentatge of emails sended.

Wich is the best option for send the data between de controller in wich function the mails are sended and send them to for show this data in real time with jquery and show this data after click on the button wich sends the event to the list of emails for the event?

Example of data that I want to be shown: 1/500 (0,5 %) (1 is the mails sended, and 500 the total that should be sended, and the percentatge).

Thanks in advance.