When your return was stopped for ID verify it had been accepted for processing but it had not started to be processed ... now that they know you are the real person filing the return they put it into the processing "pipeline" and that will take as long as it will take ... IRS tries to process a return within 21 days however it can take much longer.
Think of the IRS process as a long pipe line. Some returns will be rejected before being allowed into the pipe and the rest will be accepted. Then once accepted into the pipeline many will process directly through without any delays and some will not. Some returns will be siphoned off for further review of some kind. The basis of what triggers these reviews is a well guarded secret but some are just picked randomly every year.
Some reviews are automated and some will require human attention. The processing times will vary and due to the continued understaffing situation and the gov shutdown they are likely to take much longer this year than last.
