If he owns all of those leads, yes.
There are two other ways:
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Interesting Moments on the lead record.
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Create a campaign to Trigger an Alert of some type to send to the Sales manager whenever a lead Has Interesting Moment or Visits Web Page IS ANY.
You can restrict either option to report on the entire database or just a key group of leads using the Smart List.
You could also choose specific pages to trigger this alert. Keep in mind the sales manager will then start to receive dozens of emails an hour.