You are correct in terms of peacetime deployments. These aircraft will be deployed north defending LOC, the Chenab Ravi sectors,Islamabad and Lahore, Most of the PAF F-7s are being stood down as reserves as they are replaced with JF17s, and South Sindh is less critical than Islamabad.
The BAF's contribution to the war will be largely symbolic like the RAF
"supporting" US operations against Syria with token strikes by Tornadoes.
But it will be a huge headline grabbing diplomatically and psychologically damaging event for Pakistan if a BAF Mig 29 brings down a PAF F-7.
Hasina Wajed will be adored as the next Indira Gandhi.
It will be India's Abhinandan media event.