One way (my choice, at the moment):
With your figure  50 and Over OR Less than 50 in Call A1
In B1 enter    = If($A$1 >= 50, "On Schedule","Behind Schedule")
Also, with B1 active, Got to Foramt Conditional Formatting and
Select FormulaIs,  enter   =$A$1>=50   then Click on the Format button
Select Font  Color  Green  OK, Ok,

Stay in Conditional formatting and click on the Add... button
There again select  FormulaIs  = $A$1<50    Click on the Format button
Selct Font Color  Red,  Ok. Ok.

You should be Good to Go !!
HTH
Jim May