This phrase could mean so many things, making money drop like rain, making indictments drop like rain.

But I think it has more to do with the gathering force of people's anger as they awaken, and become angry towards the promoted divisiveness/disunity, restrictions, and falsehoods. All this awakened anger affects weather patterns in our natural world. This June, I especially see these extreme weather outcomes in Canada where more and more anger surges at Trudeau's actions/policies.

"…the need for us all to deal with our anger and fear, and to remain peaceful as much as possible, as she warned she could see dark clouds of anger and fear around the planet; causing disharmony and disruptions in the natural world. She told us that excessive anger from humans was causing natural calamities, like earthquakes and floods."

https://upliftconnect.com/ancient-indigenous-rainmaking/