They're most likely going to remain similar to what they are now. Judging by experience with Border collies of our own with different ear types.

Our Mist had semi-prick ears when we got her at 13 weeks but they stood up not long after and I thought they'd stay that way but when she was about 11 months old, they both went back down to lovely semi-prick ears.
Jess, her daughter, also had ears that stood up but they stayed up.

My sister has one who has rose ears and for a time, one of them sort of folded over the top of his head but they've gone back to being rose ears again.