<template>
    <lightning-combobox
            name="progress"
            label="Status"
            value={value}
            placeholder="Select Progress"
            options={options}
            onchange={handleChange} ></lightning-combobox>

    <p>Selected value is: {value}</p>
</template>

https://developer.salesforce.com/docs/component-library/bundle/lightning-combobox/example