I don't think so, but you can use code to check for that.
Code for parent:
var camera = $Camera2D
if $Camera2D.global_position.distance_to(global_position) < 1.0:
#enter code here
The reason for the "< 1.0" is that Camera2D uses linear interpolation for smoothing its movement. The farther away its target is, the faster it will follow. This means that it will follow very slowly when it is near and it will reach its destination very slowly, if at all.
But if we use the "< 1.0" then we're forgiving it a bit for the sake of it working.