Date: 202003
Local time of day: 0601-1200
Location: ZZZ.TRACON, US
Light: Dusk
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Initial Approach
Airspace: Class B ZZZ
ATC / advisory: TRACON ZZZ
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Distraction
Anomaly: Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance
Contributing factors: Environment - Non Weather Related; Human Factors
Primary problem: Environment - Non Weather Related

Narrative: We were descending into ZZZ on the ZZZZZ2 Arrival when we were given a vector to the east and held up higher than normal. Upon handoff to the final Controller; we were still at 12;000' and the FMC was telling us that we would be about 1500'-2000' high after I extended the centerline off the FAP.  I had briefed the visual Runway XXL backed up by the ILS. However; due to being concerned about how high we were; I didn't go through the FMC to brief those points as well. Unbeknownst to me; my F/O had put in XXR and I did not catch it via a correct briefing. We were given a vector to join the XXL Localizer and I extended the centerline and then selected LNAV to join. My mistake allowed us to go through the XXL Localizer; and we aligned up with XXR. Due to it being dusk and the distance made it slightly difficult to tell; but thankfully the Final Controller saw what was going on and asked us which runway we were setup for. We immediately came back to the left; joined up with Runway XXL and landed without incident.With news of the COVID 19 Pandemic fresh in my head; I can state quite certainly that I let my worry and thoughts of what is happening to Company and the industry creep into my job performance. I let outside threats cloud my performance and I was not focusing on the task at hand as much as I should have been. My briefing was rushed; and because of that and that ATC left us high; I completely missed that the FMC was setup for Runway XXR instead of Runway XXL. In times like this when the stress level is high; we need to hammer home the importance of standardization; and I need to remind myself to slow down and make sure that both my F/O and I are sufficiently briefed and we both have a shared mental model of what we are going to do. After landing both my F/O and I walked back through the event and identified what went wrong; and how we strayed from not properly briefing the approach. As the Captain and Pilot Flying I should have taken the extra minute or two so that every aspect of this simple approach was briefed and talked about.  Slightly contributing to this incident is when ATC asked us what runway we were lined up for instead of telling us what he was seeing. When ATC asks a question like this; there is always a 5-10 seconds of hesitation as we are double checking to make sure we have it right. I think ATC telling us what they see instead of asking us might be a quicker way to get the problem resolved. Of course in the end it is my fault that this happened; but I would rather ATC tell than ask.




Synopsis: Air Carrier Captain reported lining up for the incorrect runway on a set of parallel runways.