My power steering pump has failed on mentioned ford model and steering is harder but drivable. Is it safe to drive around 1000 miles with this issue, since I have no time to repair it and have already booked a vacation?
Yes, no, maybe...
It depends on how it has failed. If the internal seal etc failed so it just does not pump then probably yes.
If the bearings have failed and the pump will break and possibly damage something else then no.
If the pump seizes and takes the belt out, then whatever else driven by that belt also stops.