A sitting president can’t be indicted which is why they must be impeached first.
Impeachment is the indictment. The impeachment process undergoing currently is the grand jury investigation. Depending upon their findings, the House holds a vote on whether to indict or not aka to impeach or not. Then that decision, if the decision is to indict, is sent to the Senate, where the actual trial is held.
Impeachment is the indictment.