Yes, it is good option to pick M-4 from Gojra before evening.
I traveled last year through Shorkot Cant- Toba in the month of October. Although, it is almost 30-35KM distance from Shorkot to TTS. But in the evening you will find only fields along the road till TTS.
Although single road is in good condition but you will find no electricity pool or anything before reaching TTS. You will feel that you are only traveling in this lonely road.
Not suitable to travel after evening or late night in my opinion.