In the electrical characteristics section of the datasheet you can see the maximum output current as a function of the input voltage.
You could also work this out as a function of the duty cycle and the input current limit
For a boost converter the max load current can be estimated as a
efficiency * (1-D) * (I_in dc)
efficiency can be estimated from the electrical characteristics section in the datasheet to be roughly 95% at 200mA load
D is the duty cycle Vout/(Vout+Vin),
The input current is limited according to the electrical characteristics (1.1A).