Ports is on 1.4.7.

* https://freshports.org/sysutils/btop/

The fix is still pending being even made to the origin version.

* https://github.com/aristocratos/btop/pull/1728

>I like the command for viewing the ARC cache size

zfs-stats is also nice for more zfs internals like hit-rate L2 etc..

https://www.freshports.org/sysutils/zfs-stats