Very unscientific comparison here, but…
Todd Gurley tore his ACL on 11/15/14 of his senior year. He took his first 7 NFL carries on 9/27/15 and took 21 and 30 carries the next two weeks. Timeline from injury to his first carry was 316 days.
Diggs was injured on 1/1/24. If he follows Gurley’s timeline, we could expect him to be back in Week 11 vs Georgia on 11/9/24. That would be 313 days from injury. More likely, I think they’d keep him out until the Egg Bowl and give him an extra 2 weeks to recover.
TLDR: don’t expect much from Diggs this year until late/post season.