async isOpen() {
        return (
            (await $(this.modalRootEl).isDisplayed()) &&
            (await $(this.modalRootEl)
                .$('button[id="time-picker_ok-button"]')
                .isDisplayed()) &&
            (await $(this.modalRootEl)
                .$('button[id="time-picker_cancel-button"]')
                .isDisplayed())
        );
    }
Returns true when the picker modal is open, false otherwise.
@method
@returns {bool}