Fresh Claim Inquiry

[GraceKay]

Hello all!
I submitted further submissions (for a fresh claim) at the beginning of March. I received a confirmation email saying my fresh claim had been accepted I'm now "waiting for their decision". I intend to give notice to marry in June (He's American, not British).
Here are a few questions I was hoping someone could help me answer.
1: Since my fresh claim has been accepted, what am I right now? Am I illegal? Am I still an overstayer?
2: Is the Home Office reviewing my asylum claim? Or just the evidence I've brought to them?
3: I don't mean to sound impatient, and I do not expect the process to be quick at all. But can I ask for a rough timeline of the process from fresh claim submission to decision (either positive or negative).
4: What is Discretionary leave?
As you can tell I'm new to all this, please be patient with me.