It would take about two days for the Probe to run in from the outer system to the planet. Since orbital positions are re-calculated every five days, there's a 40% chance that the planet will dodge out of the way before our probe arrives.
So instead, we'll return to the jump point, as if we'd just transited into the system, and then we'll WAIT until the next five-day turn increment goes by, so that the planets are freshly moved into new positions. THEN we'll fire off the probes, one at each planet, and they'll spend two days running in to the targets... while the next five-day turn increment is still three days beyond that.
