るところだ

るところだ is used to describe an action that is imminent or about to happen very soon. The verb is in its non-past dictionary form, followed by るところだ, to express that the speaker is on the cusp of performing the action or that something is about to occur. This is typically used for actions that the speaker is about to start or for moments that are just about to happen in the near future. It’s common in everyday conversation and narrative to convey a sense of immediacy.