Excel or Google Sheets are great tools to use to track a time study. There's a template on the Optimize For Outcomes resource site or you can make your own.
 
You only need a few columns in your spreadsheet. Track the person doing the work (if you have more employees in your business), the system that the work pertains to, a label for the work being done (e.g. "Research Content" or "Write Blog Article" or "Pack Orders"), and the time spent on the work.