When is it a good time to stop working and prepare for new baby?

Elizabeth
Im 33 weeks and work at a daycare full time ,
Also have almost 5 year old . Lately I've been   really tired and just want to sleep. My belly is huge , cant really walk much or stand much but that's what my job in tails . Find myself feeling bad not being 100% at work because I'm just so tired . I get out at 630 , home by 7ish , cook dinner then have my daughter play for a bit , eat , shower then sleep . Half the time I can't keep my eyes open . Im wondering if it's time just to stay home and relax and prepare myself for a new born . Thoughts ?