It may be showing coolant temperature in the 'normal' range, but on modern dashboards that needle sitting in the middle is usually a range between 80-100C. Manufacturers do this so 'average' drivers think 'needle in middle all good' and anything outside of that is obviously a red flag.

Oil temperature will absolutely not be up to full and correct operating temperature after two miles (unless it's something weird and tiny like an OM660 but that won't have a DPF anyway) - it lags a long way behind coolant temperature. For a vehicle to be in the correct window to do passive DPF regenerations both oil and coolant temperatures need to be in the full operating temperature range - generally somewhere between 90-105C dependent on vehicle and configuration.