Try to get it into the ground as soon as you can but don't expect too much of either of them this year. All well and good that the other one is in blossom but the potted one will catch up once its got some room to put down roots.
If the potted one is not in the ground by the end of April it will really struggle against the dryer months of June and July. Could you put it in anyway and wait for the trellis to follow?



