Looks like Tim is working on his own record. Dave talked about it in a recent interview
"Dave: ... Tim and I are writing songs for my next record, we are working on songs for a release of Tim’s, and there are few other little surprises up our sleeves. We don’t have any concrete plans for now, we are sort of waiting to see what happens with the election to know if we even have a shot at playing shows in 2021."
I'm gonna chase the mermaid and let her take me to the deep