Suspect they'd go ~1pm Saturday timeslot for the first prelim, then maybe the same time but on Sunday for the second prelim and the grand final.
I guess this could work assuming there would be Thursday night games for the first 2 Rounds of AFL.
Example:
Round 1 AFL
Thu 7.20
Fri 7.50
Sat 3.20 4.35 7.25 7.40
Sun 3.20 4.40 7.40
AFLW Prelim Finals
Sat 12.45
Sun 12.45
Round 2 AFL
Thu 7.20
Fri 7.50
Sat 1.45 2.10 4.35 7.25 7.40
Sun 3.20 4.40
AFLW Grand Final
Sun 12.45