My primary swing check:
I take the club back to backswing parallel. Then I look to see if the club head is outside, or closer to the target line than my hands. If I initiate my lead shoulder down move to start my backswing, I will be in that position every time. If the lead shoulder moves off the ball, or rotates flatter, the club head will be in-line, or behind my hands at backswing parallel, thus my hands will be closest to the target line. We see pros all the time on TV doing half backswing checks.
During that check I also need to feel the beginnings of a weight transfer into the inside of my trail foot.
This check takes 3 seconds, and anohter 3 seconds if I don't get it right, and it helps to curtail a LOT of other issues, and it's the same check for all clubs and/or shots.
Ball position, Weight forward, hands slightly forward, eye on back of ball.
But usually I prefer cash ( building disposable income for MBWA) .😝