That all depends on Starlink supporting point to point inside their network. Also that path will be more zig-zaggy than the great circle fiber path and importantly will vary during the day as the satellite tracks shift relative to earth. [0]

[0] Unless their in a harmonic orbit I guess not 100% sure abou that one. There should always be some jitter in the connection time just from the satellites moving even if their ground tracks are very stable.