When do new infantry contracts drop

So right now I am enrolled into the DEP program and signed a recon contract (not a really smart idea I know) before signing I knew signing a recon contract wasn't the smartest thing to do and was planning to go for an infantry contract and then volunteer for recon during SOI, but it was shown to me, that at the time that they had 0 slots left for infantry at least in that time frame. So I decided to sign a recon contract to at least solidify a recon position and I was informed that later down the road when new jobs drop and if there are infantry slots open I can switch my job. Because right now my biggest concern isn't recon training itself, its getting fucked over, especially seeing things where people on recon contracts are going to MCT and not IMC which I view as basically prepping you to fail, as MCT is shorter and easier than IMC which wouldn't really help you build up rucking or give you more time to train up, and if you do fail during the RPAT or BRC you'll be fucked into an open contract and not be able to fall back on infantry as you didn't go through IMC.

So all in all my question is what time frame do new contracts drop so that I'm able to hopefully switch my recon contract to an infantry contract.