Hmm let's see. Normally shallots are planted at the same time as onions, or a little bit before, so at the end of winter (Mine went in in March). They are planted just below the surface, like onion sets.
They should send up green shoots after about 10-15 days, just like onions. When the grow, the bulb divides and they form like a little bunch. As they swell and ripen, they gradually push their way out of the ground. Then the stems will start to yellow and shrivel, They should be ready, oooh any day now?
If they have stayed below the ground and never come up then I am afraid, in layman's terms, they are buggered. Start again next winter? Perhaps some people overwinter them, personally I don't, but even so you see growth, in that case, just like with garlic.