My two youngest are also 22 months apart. We were tight on space so we left our 22-month-old in his crib in the room that he was already in (with his older brother and sister) and the newborn slept in his cradle (and his carseat, and our bed) for several months. We got a toddler bed for the older one when the baby was about 4 months old. We moved when the baby was 6 months old and didn't transition him to a crib until then.
As others have mentioned, it's important to make the transition totally unrelated to the arrival of the new baby. If your 19 month old shows signs of being ready to go to a big boy bed (or a toddler bed, whatever you're planning on) now or in the next month or two, then go ahead and do it. Make a big deal out of his new room and new bed and let him help pick out bedding and decor (those wall appliques that you can remove later are great!). If he's not ready to move out of the crib (or out of his room) then have a backup plan for your new baby (a bassinet in your room, for example) and wait a few months until your older one has settled into his role of big brother before working on getting him out of the crib.
Congrats on your new baby and good luck!