I’ve done the exact same job as you before. My dad did that job too, and is now a bricklayer, for about 15 years. He’s got a lot of wear and tear on his knees mostly, from kneeling all the time while laying block/brick/stone, and a lot of shoulder and back pain.
Anyway, he doesn’t lift. I did lift when I did it, and I would just go after work. I delivered newspapers 4am-7am, then ate breakfast and worked again 8am-5pm. Went to the gym as soon as I got off work. I would squat, deadlift, press, etc all after work. I’m a pretty big believer in the fact that if you train, for example, your lower back, and expect it to get stronger, it will get stronger. I’d say it really depends on your goals - I wanted to get better at the big lifts. So that’s why I trained them. If I wanted to improve conditioning or focus on size, I’d maybe do something different.
You’re pretty young right? My personal opinion, based on my own experience, is sleep as much as possible at night. I can fuction on 4-5 hours of sleep, but mentally it just feels great to know you get as much as possible each night. Lift after the gym, and like others have said, after some adapting, you won’t really be affected by lifting after work. I feel like the job is “easy” in the sense that it’s never like max effort work, just a lot of continuous semi-heavy work. You feel the burn for sure but definitely never exhausted if you’re eating and drinking enough.
Just my two cents. Best of luck! Do you have a log?