Any idea on USCIS Biometric appointment timeline for 2021

My employer is finally about to file I-140 and I-485. But I’ve plans to travel abroad within 1-2 months from now. I was wondering if somebody has filed recently and how fast you got biometric appointment.
Would it be okey to reschedule if I happened to be outside of US. I also have to re-stamp new H1B during this trip , thus it’s going to be about 2 months trip.