The state of something being currently underway or in progress (e.g., a meeting, project, or construction).
会議はただいま進行中です。
The meeting is currently in progress.
工事が進行中のため、この通りは通行止めです。
This street is closed because construction is in progress.
プロジェクトはまだ進行中で、結果は未定だ。
The project is still underway and the outcome is undecided.
手術は無事に進行中で、予定より早く終わりそうだ。
The operation is progressing without problems and looks like it will finish earlier than planned.