First time flyer on Singapore Airlines in April. I'm booked on PE from BOM-SIN-SFO. Curious on how upgrades work. I don't have any status on KrisFlyer and literally just signed up.

1. Are upgrade offers sent out to folks regardless of status?
2. When does this process start?
3. Right now, it will cost me approx. $10K USD to upgrade to business for cash. What does FT think about this - should I wait? What kind of offer should I expect?
4. How do I know what the availability is currently?

Thanks in advance!