Progress:
the code for the basic block explorer is published on Github.
Documentation work has started ( WIP ) and can be viewed using this link Welcome to Zcash explorer - Zcash explorer
Screenshots of the UI.
Realtime homepage ( uses WebSockets powered by Phoenix LiveView ) :
Block details page
Transaction Page
Address details page
Payment Disclosure page
Broadcast raw TX page
Viewing keys feature is WIP ( this also will use WebSockets )