Welcome.
You need to rest after an injury like that, as its all too easy to add setbacks to the healing process by resuming activities too early. That said, I'd feel more confident riding a turbo than taking a bike out onto the roads when easing myself back into it. After all, a turbo is only ever 5 seconds from home. You're not likely to run into anything. You're not likely to find yourself needing to pull away in the wrong gear, or on an unexpected climb.
On the flip side, turbos can be boring as hell, and the satisfaction of making a good whirring noise is probably NOT why you ride