We started distributing webtunnel bridges over circumvention settings in Russia less than a month ago. We were waiting to have enough bridges to do so.
Circumvention Settings does distribute different bridges each day, that means that your bridges might take weeks until they get distributed.
So is normal not to see much traffic over them for some time. But we do need to pace our bridge distribution to make it harder for censors to block bridges and to keep users with stable bridges.