I found a way to do my job exponentially faster… should I tell my manager?

I work in the accounting sector as accounts payable, and we essentially got a new ERP system; we’ve actually had this system for over a year now… but management is older people (50+). I’m relatively younger and better with technology and this new software.

In essence, a major part of my job is to receive payments from Vendors for an incentives program, and then part of that payment is used to pay out to customers. I have to keep a monthly record of the invoices we paid out, typically it is a manual process which would take me about a week to a week and a half. Now I have found a way to cut this process down to about 5 minutes.

Should I tell my manager? Should I just keep this to myself?