There is a somewhat easily digestible explanation of the quantum Darwinism theory here: https://arxiv.org/pdf/1811.09062 https://arxiv.org/pdf/1811.09062 Howe

There is a somewhat easily digestible explanation of the quantum Darwinism theory here: https://arxiv.org/pdf/1811.09062 https://arxiv.org/pdf/1811.09062 However, it still doesn't really address the core question of when the collapse actually occurs. All it really seems to add is that the environment is an "observer" and that decoherence actually causes the collapse.