They're probably more or less on ToP KKx20 Goku's level. Logically, they'd need to be inferior to his Genki-Dama when Trunks destroyed Giant Mutated Zamasu with a Genki attack made from far less, far weaker participants, though by how much that scales to that version of Goku is questionable.
That said, they're definitely more than 100x stronger than SSG Goku, possibly around 200x stronger.