ZF released zebra 2.5.0 with NU 6.1 testnet support; ECC released zcashd 6.3.0 last week. If you run a testnet node please update soon. Activation currently expected to happen early monday UTC (2025-08-11T06:34:18) and it has been consistently moving earlier due to increase in hashing power.
cc @Cacho to update the block explorer