485 process will not stop

How to process concurrent 140/485 is the practice of each service center. Some may process them together, some may process 140 before 485.

140 and even 485 will be processed regardless of visa cutoff date. Only when all the processes are done and they reach the point to approval your GC, will they need a visa number for you to adjust your case. That in turn needs your PD to be reached by cutoff date. So you'll see all the processes, such as 140 approval, 485 FP, EAD & AP approval if you apply, FBI check, except the final approval of 485.

That's why people rushed to file 485 to avoid wasting of processing time while waiting for visa numbers and to get benefits such as EAD & AP, and AC21 portability.