First of all, as opposed to the Super 12 matches, the minimum number of overs which must be bowled in the second innings to determine the result of the knockout match has been increased to 10. Then, there is the reserve days as well.
According to Accuweather, there are 84% chances of rain on Sunday, meanwhile, on the reserve day, the chances of rain are as high as 94%. To make sure that a result is determined, ICC have increased the playing time on the reserve day, from two hours to four hours.
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However, the officials will hope that a result can be concluded on Sunday itself, even if it takes for both teams to play just 10 overs per side. If that also cannot happen, then the play will resume on Monday from where it was halted on Sunday.