You need to evaluate the status of each step and recombine them into a single row per event (stats), then evaluate your success condition ...
| eval status1=if(step=1,status,null)
| eval status2=if(step=2,status,null)
| eval status3=if(step=3,status,null)
| eval status4=if(step=4,status,null)
| eval status5=if(step=5,status,null)
| eval status6=if(step=6,status,null)
| stats values(status1) as status1, values(status2) as status2, values(status3) as status3, values(status4) as status4, values(status5) as status5, values(status6) as status6 by event
| eval overall=if(status1="SUCCESS" AND status2="SUCCESS" AND status4="SUCCESS" AND status5="SUCCESS", "SUCCESS", "IN PROGRESS")
| table event, overall
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