I am convinced that this is how you could run a successful sales team in the ~dozens at a software company before needing a dedicated crm. We prematurely opted for a crm once we had five sales folks and so many calories were burned just managing the systems to ensure the data was just so. "Clean data" was our obsession. Huge waste of time.

If I had to do it all over again, I'd do it how we started: sales meeting every Monday. Open last week's meeting text file. Review the current status of deals. Remove ones that are dead, add ones that are new, update ones that changed. Save file. See you next week.