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Everywhere does it differently. If you've not seen anyone in your first few weeks or on your first home depot visit make sure you find out who they are and get to see them
I didn’t see anyone until 3 weeks after passing out as a qualified driver. I’d suggest you go looking for them as soon as you start your driving hours. (If they don’t find you first, depends on the depot)
At my TOC, the union came to visit us during the first week of training. But as has been mentioned, different TOCs have different approaches. Sometimes, your mentor will introduce you to your union reps when you’re finally out at your own depot.