Looking at the statistics from previous years gives an idea of how many people will die in the next year. If more than the expected number die it's called "excess mortality". You can see those numbers here: https://ourworldindata.org/excess-mortality-covid

Don't forget that during the peaks of the waves reefer units were being used to store the extra bodies: https://duckduckgo.com/?q=refrigerated+trailers+to+store+extra+bodies&t=h_&ia=web