Hey, I work as a freelance artist. Check in with them.
Make sure they have a queue, ask for progress. [Just be polite!]
As well look and see if they have a ToS and check if they have a turn-around time table there.
Sometimes what is posted on Instagram or so can be deceiving though so don't feel too bummed!
I personally post my random doodles way faster then I uploaded finished commission work so it can come off that I'm barely working even though it's the opposite! This could easily be the same thing!
But as said before: Check in with them.
Life happens but communication is important on both ends!