I'm running a 4 day TM right now and have the upper body day before the lower. So far it's great as I feel like I have a full tank of gas at the start of each workout vs 3 day full body. Your 3rd squat day usually isn't programmed in a 4 day split, but only you can tell if it's working or not. Otherwise, looks like a solid setup.
Mine is:
Sunday
Press intensity rotating rep PR's
Bench CG 5x5
LTE 3x12
Mon
Squat 5x5
Chins
Wed
Bench intensity
Press 5x5
Dips 3x12
Thurs
Squat intensity
DL 1x5 top set then 1-2 backoffs - 10%
Chins
2-3 days week HITT on bike.