transaction latency ?

Hi,
I’m doing a research that calculates network performance for tezos blockchain with several keys factors but I need the transaction latency and number of validator
1- the transaction latency or average transaction latency how can I know it or calculates it.
2- number of validator ho can I know number of validator for tezos network

I hope could help me in this situation

thanks

https://tzstats.com/docs/api#tezos-api