I'll assume Benatar's weight is 100 tons since it's a big plane
And its speed is capable of crossing planets as seen before it hits the teleportation gate
I'll approximate velocity by first comparing the planets to Earth as per the norm (diameter: 12742 km).
I'll assume there's 0.0016 AU orbital distance between these worlds, they look pretty far apart as is, and that's the minimum known distance between two celestial bodies orbiting in the same system.
Note: I could justifiably do way more than this - just like how I could use the speed of the yellow color engine, which Thor is working against, and measure from a Saturn type planet and the relevant distances between it and what seems to be an ice giant like Neptune or Uranus...and this will be the high end.
But I have sworn to go with the low end to purge myself of bias. Onward!
Velocity: 2 planets and interplanetary distance -> 25484 km + 0.0016 AU = 264840600 m/s or 88% speed of light
Kinetic Energy -> (γ - 1)mc^2 where γ (ie gamma, borrowed from Hulk) is 1/sqrt(1-v^2/c^2)
1/sqrt(1-264840600^2/299792458^2) = 2.13403932698
(2.13403932698-1) * 100000 * 299792458^2 = 1.019223718×10^22 J or 2.44teratons of TNT
Approximating with Saturn instead (diameter: 116460 km)
Velocity: Crossing one planet and interplanetary distance -> 116460 km + 0.0016 AU = 355816593 m/s or 118% speed of light
Since this has crossed the light barrier, the conclusion is that it has peaked at infinite energy at one point or another.
The audio description confirms the Benatar is traveling at hyperspeed, which is recognized as being faster than light. It also notes that passing stars appear as a blur. Thusly I do validate this calculation.
You can interpret the second part of the statement for the actual yield to be a gazillion times higher (size and proximity of stars) than it actually appears on-screen, but I believe the calculation needed to be based on primary visuals first, background visuals second. In this case velocity would be measured in light years or parsecs per second.
You all know of when Thor spun an entire realm just by bracing against the escape pod of this ship in Infinity War, but if that doesn't help, Pluto weighs 1.3 x 10^22 kg. And Thor provided enough of a pull to reasonably move nearly twice that.
1.019223718×10^22 J = 1/2 x (1 m/s)^2 x m
m = 2.04 x 10^22 kg
This is Pluto.