When he had surgery the timeline was the all star break. So it's longer than expected
Agreed, he is 4 weeks behind schedule.
The injury was Dec 26 -- six weeks was the reported timeline. This takes us to Feb 6 (~2 weeks ago). In 2 weeks it is March 4 -- ~10 weeks from the injury date.
The timeline did not change with surgery. Surgery allowed him to get to game shape sooner.
"Originally, Burks' timeline was set at six weeks. That won't change drastically with the surgery. But surgery would allow Burks to return to weight-bearing activities around two weeks after the operation. That would allow for a more rigorous rehabilitation and allow for Burks to return to game shape faster, when he's ready to return to the floor, according to a Utah Jazz source."
https://www.sltrib.com/home/3356480-155/utah-jazz-alec-burks-chooses-surgery