How to calculate bitcoins in fees spent dailly? (Avg)
Yes that look correct.

From https://bitcoinfees.info/, the current average fee rate listed at the bottom of the chart is 24 satoshis/byte. To calculate the total fees in a day you want fee rate * total bytes = total satoshis.

Assuming 2MB block size,

fee rate = 24 satoshis/byte
total bytes = 2MB * 6 * 24 = 288MB

total btc = total satoshis / 1e8
total btc = (24 * 288M) / 1e8 = 69.12 BTC