"In most of Europe, East Asia and North America the peak of the pandemic will probably have passed by the end of this month [April 2020]." [1]
We define 'the peak of the pandemic' as the month with the highest number of recorded casualties by the virus (COVID-19).
Wikipedia has the number of COVID-19 pandemic deaths listed by country, as reported by the WHO.
Caution: These numbers are cumulative. Monthly numbers are calculated by subtracting a month's numbers by the previous month.
[1] The Economist - "The world after covid-19. Bill Gates on how to fight future pandemics" by Bill Gates. 23 Apr. 2020
[2] Wikipedia - "COVID-19 pandemic deaths"