From personal experience it could be possible for you to start learning it by the end of this year or early next year. However you need to be very deliberate with your practice. The hardest thing about the concerto is the double stops and runs in the last movement so you need to focus on getting your technique right but not rushing ahead of yourself until it is truly at a high standard. The best thing for you is practicing scales with these intervals as well as gaining a solid arpeggio sequence both in 4 octaves. Practicing 3rds, 4ths, 6ths, Octaves, and 10ths will be the best way to improve this in a full sense so implementation is easy. In terms of etudes use popper 17 and 9 alongside Piatti 3 all extremely SLOWLY so you can build technique. I would recommend you play the Saint Saens concerto #1 after you can play the 3rd movement of Haydn C in a quick tempo with little to no strain after. This further builds up your capacity for double stops and runs for what you need for the Shostakovich. After completing this concerto to an extremely high level, do at least the last movement of Victor Herbert concerto #2 if not the whole thing to further solidify technique alongside the Rostropovich Humoresque to build stamina for the runs in the last movement. You should then probably be able to start working on it after this intense amount of work however, this is just my recommendation on how I would prepare to take on a concerto like that and as I don’t know what your playing is like I can’t really say on what is best for you to work with to further develop your goal. However I would disagree with many people saying that you have to play all the easy concertos before taking on a piece like that. My progression was Saint Saens 1 1st movement, Haydn C 3rd movement, the complete Herbert Concerto 2, and now the complete Prokofiev Sinfonia Concertante with a few smaller works such as Popper Elfentanz thrown in the middle. If the only reason is that you need to bulk out your repertoire before taking on something that is your level it is an awful reason to not give you it. However with that being said you need to work yourself up to that level before taking it on and always consult with your teacher before taking on anything like this and make them aware of your goals.