A great tool to monitor the progress over the 2,016 block epoch is fork.lol's Difficulty Retarget chart:

bitcoin

📉 Bitcoin Mining Difficulty decreases 5.01%, to 27.69t

BTCMiner

Stats:

Difficulty:

- https://www.bitrawr.com/difficulty-estimator
- https://www.coinwarz.com/mining/bitcoin/difficulty-chart
- https://bitcoinexplorer.org/difficulty-history
- https://insights.braiins.com/en/cost-to-mine/

Hashrate:

- https://www.coinwarz.com/mining/bitcoin/hashrate-chart
- https://bitinfocharts.com/comparison/hashrate-btc-ema14.html#3y

ASIC Prices:

- https://data.hashrateindex.com/rig-index-data

A great tool to monitor the progress over the 2,016 block epoch is fork.lol's Difficulty Retarget chart:

- https://fork.lol/pow/retarget

And some great Dashboards, overall:

- https://timechainstats.com
- http://vaccaro.network:3838/bitcoin/#shiny-tab-bitcoin_pools_dashboard
- https://mempool.space/mining
- https://insights.braiins.com