The short answer is NO.
We expect to begin alpha testing the 64bit version of Dramatica Story Expert some time in 2021 after the release of Movie Magic Screenwriter 6.7. Since the 64bit version of Dramatica Story Expert requires a full rewrite, we are using much of the technology developed during the development of the 64bit version of Screenwriter.
For those on Catalina, we have an interim workaround using VirtualBox. Here is a FAQ with directions on how to set up the workaround. We've found the performance of Dramatica Story Expert 5.3 on the virtual machine running on Mojave is robust.
At this point it is unclear if the VirtualBox workaround runs on Big Sur.