It seems to be common to have a second wave in pandemics. So, I’m sure this virus will be no different. Previous WHO docs state a second wave hits 3-6 months after the first wave subsided.
There were several waves in the 1918 flu pandemic.
I discovered a couple weeks ago the second wave killed a distant cousin in Alberta. It also severely sickened a great uncle serving in France, but he made a full recovery.