Hello Ravikant,
There are not benchmarks publicly available for the i.MXRT1175, but you may contact your NXP Distributor or FAE to ask for more information.
What is available online from ARM is benchmarks for their cores, which may serve as reference (links below)
https://developer.arm.com/ip-products/processors/cortex-m/cortex-m7
https://developer.arm.com/ip-products/processors/cortex-m/cortex-m4
I hope that this information helps.
Regards,
Gustavo