async isRightMonthDayFocused(day) {
        const buttonEl = await $(this.rootElement)
            .$$('table[role=grid]')[1]
            .$(`button=${day}`);
        return (await buttonEl.isExisting()) && (await buttonEl.isFocused());
    }
Returns true when the specific day button element on the right month has focus.
@method
@returns {bool}