"finished practice" is correct and usable in written English.
You would typically use it to describe when someone has completed a particular practice or activity. For example, "The football team finished practice early so they could go to the movies."
He had just finished practice.
The Celtics had finished practice and he was on his way home.
Kidd finished practice yesterday and walked off the floor without granting interviews.
He was seen shooting on another court while the rest of the Knicks scrimmaged, and he finished practice in the training room.
#RussianGP #Sainz pic.twitter.com/2PXyPjYaVA With the session immediately abandoned, Nico Rosberg finished practice fastest ahead of the Williams of Valterri Bottas.
The Indiana Pacers had just finished practice, and one of the veterans wondered if anyone could dunk from the foul line.
Camby did take to the floor after the team had finished practicing and shot by himself.
— Moments after her son finished practicing with his fifth-grade tackle football team, Beth Sparks examined his scuffed and battered helmet for what she admitted was the first time.
After the Knicks finished practicing, Carlesimo and Mike Breen, who will be the play-by-play announcer for the game, interviewed Allan Houston, Mark Jackson and Coach Don Chaney.
By their third year, the students are finished practicing on one another and are ready to work in clinics with clients who cannot afford more expensive lawyers.
REBOUNDS CHARLIE WARD, who had surgery on his right knee on Nov. 27, was on the floor after the rest of the Knicks finished practicing, fielding passes from the assistant coach DON CHANEY and firing up 3-point shots.
