Sorry to hear about your injury, but rest assured that you’ll be on the road to recovery after surgery.
I had the same surgery almost seven months ago - ACL reconstruction using a hamstring graft, as well as a meniscus repair. My hamstring is already close to full strength compared to my other leg. The first two months or so after surgery, your hamstring feels basically like dead weight. I couldn’t pull my foot up behind me more than 12 inches for a while. It’s pretty amazing though that soon enough with basic rehab, the rest of your hamstring begins to compensate for the missing piece, and you begin to get your strength back.
It obviously requires a lot of hard work and diligence to get everything back, but it is possible. The only difference I can tell now, even at just seven months out, is that the hammy on my surgery leg tires out quicker than the other one. If I do any kind of isolation work, like one-leg hamstring curls, I can do more reps with my healthy leg than the surgery leg. Strength-wise though, I can do the same weight on both legs for all unilateral exercises (mainly single-leg RDLs and Bulgarian split squats).
I started deadlifting (very light weight) at around three months once I was cleared to run. The big compound lifts take some getting used to though since you will probably have been using your other leg more since your injury. I will say it’s still a bit of a battle to consciously make myself distribute the weight equally on both legs at various points of the big lifts (squats and deads).
I notice it more with deadlifts and DL variations, but that may be because I have spent way more time squatting since surgery (2x week back squatting, 1x time DLing), so I’m a little more used to that movement. I have recently changed my routine and am now squatting and RDLing twice per week with an upper/lower/upper/lower split.
Not to start throwing numbers around, but I was able to squat 245 for one rep past parallel about three weeks ago. I had never 1RM’ed more than 290 before my injury, so I’m considering that my pre-injury max. I’m pleased with 245 for now. I haven’t tried to max out my deadlift, but the most I’ve even tried to pull since surgery was 235. I had gotten up to 355 before the injury, so I have a ways to go with that.
All that said, I’ve also found my lower back to be weaker and had a pretty bad strain about 1.5 months ago. Just a heads up that the supportive systems involved in those heavy lifts also weaken, more than you may realize.
Anyway, I don’t want to start rambling about my recovery any more than I already have. If you have any questions, I’m glad to help. rehan_bl is also on this board going through the same thing, and he’s at around the 5-6 month mark I believe. He would also have some good insight to the recovery process.