call
price changed color recently.
It's near the bottom band.
there is space between the candle with the arrow and the upper band.

put
price changed color recently.
It's near the upper band.
there is space between the candle with the arrow and the bottom band.

expiration time: end of the next candlestick of the timeframe above the current one.

example:
timeframe: M1
trade entry > 02:57
expiration > 03:05

end of current 5 minute candle : 02:55
close of the next 5-minute candle: 03:05