300 audits were in progress at year end (and another 150 completed) as a result of OTIP tips

When asked for updates on the offshore tax informant program, CRA stated:

As of December 31, 2019, the OTIP has received nearly 5,500 calls of which of over 1,600 have been from potential informants, received over 750 written submissions and has entered into nearly 50 contracts with informants.

… [O]ver 150 audits of taxpayers have been completed, nearly $60 million has been assessed of which approximately $20 million has been collected and over 300 audits of taxpayers are in progress.

Neal Armstrong. Summary of 2020 STEP Roundtable, Q.16 under s. 152(1).