The Scottish Professional Football League has confirmed the final round of bottom six fixtures in the Premiership will all kick-off at 15:00 BST.
The league campaign ends for the teams in the bottom half of the table on Saturday, 23 May.
With three matches remaining, St Mirren are eight points adrift in last place.
Motherwell are currently in the play-off position, six points behind Ross County and Kilmarnock and with an inferior goal difference.
The team finishing 11th will meet either Hibernian, Rangers or Queen of the South in a two-leg final.
Bottom-six fixtures on 23 May:
Hamilton v St Mirren
Kilmarnock v Ross County
Motherwell v Partick Thistle