In addition to what everyone else has said, there is nothing that requires ATC to have the plane lined up waiting at a complete stop on the runway prior to receiving takeoff clearance. If there is enough separation, they can clear the flight for takeoff while you're approaching the runway from the taxiway, which is why you might roll directly onto the runway and take off without ever coming to a stop on the runway (most frequently experienced this when there was minimal departure traffic and no arrival traffic on the same runway). Or you don't know how much time passed between ATC clearing the plane onto the runway to line up vs clearing it to takeoff. As someone who frequently listens to ATC while departing, it's not uncommon that when Plane A is given takeoff clearance, Plane B is almost simultaneously told to "line up and wait", and as soon as plane A will achieve the necessary separation plane B gets their takeoff instructions. Without having the ATC feed you don't know how much time passed between those instructions and your pilots responding to those instructions. For example say plane B is told to line up and wait, it takes 20 seconds before they actually start moving onto the runway, at which point plane A may have achieved adequate separation, so they can clear plane B for takeoff even though they never finished lining up/came to complete stop.

As above though, really just need to ATC feed going to know what was actually said and match it to what your flight is doing. "{AIRPORT CODE} ATC LIVE" is what I usually google to find it. Ground will get you from the gate to the taxiway prior to the runway, Tower will get you the transmissions regarding runway activity