The WHO’s estimates of the excess mortality in the COVID pandemic got published in Nature https://www.nature.com/articles/s41586-022-05522-2
The WHO estimates 14.8m excess deaths in 2020 and 2021.
This is quite similar to other estimates (e.g. the weekly updated estimates produced by The Economist https://ourworldindata.org/explorers/coronavirus-data-explorer?uniformYAxis=0&Metric=Excess+mortality+%28estimates%29&Interval=Cumulative&Relative+to+Population=false&Color+by+test+positivity=false&country=~OWID_WRL).
The WHO estimates of excess mortality associated with the COVID-19 pandemic - Nature
Msemburi et al. describe how the World Health Organization has estimated the excess mortality associated with the COVID-19 pandemic, by month and for 2020 and 2021, and analyse their estimates across the WHO member states, with 14.83 million global excess deaths estimated.