From what I see, it’s been a while.
@Channing last post was December 21st, 2019, ~3 months ago, in the Chinese language Listary 6 thread: 【我回来了】目前 Listary 6 中最缺哪些功能？
Via Google Translate, he said he was working on fixing some crashes and asked what remaining Listary 5 features should be ported over.
His last login to the forums was January 17th, 2020, two months ago.
Make of all this what you will. I sincerely hope Listary 6 progress continues either under Channing or someone else at Bopsoft.