Electrolytic capacitors generally have a voltage written on the case.
If you intend to fix this radio by replacing all the capacitors, rather than doing tests, then I suggest that you do not replace any capacitors having a value less than 0.001uF. These capacitors are generally in the RF part of the circuit and normally reliable. If you replace them you may upset the alignment of the set.
Lots of useful information here:-
https://www.vintage-radio.com/repair...ion/index.html