CRA has provided updated statistics on OTIP in 2019 on November 26, 2020 during a STEP roundtable meeting.

Since the OTIP launch, there has been sustained interest in the program by potential informants. As of December 31, 2019, the program has received about 5,500 calls of which over 1,600 have been from potential informants, received over 750 written submissions and has entered into nearly 50 contracts with informants.

Additionally, over 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.

Source: https://www.canada.ca/en/revenue-agency.html