I don't think they can expect to win this with a "safe" target, though a 300 lead seems impossible anyway, anything like that would bring the weather back into the game. If you can bowl them out in 60 overs, you only need 200 odd on the board!
When I posted we could have made 300 around about tea tomorrow leaving 4 sessions to get Pakistan out which is about standard. Anyway all trivial now as we will be lucky to set Pakistan 100 to win.