That movie is almost finished playing at the theater.
That movie is only playing for a little while longer.
ーThat movie is almost finished playing at the theater.
「その映画はもうすぐ上映が終わります」
この場合の「終わる」も finish を使って表現します。
ーThat movie is only playing for a little while longer.
「その映画はあともう少ししか上映していない」
このように only playing for a little while longer を使っても表現できます。
ご参考まで!