Chip timing (or RFID or tag timing) is used in almost all mass events, both in running events, in skating and cycling. We use the IPICO Sports Dual Frequency system, suitable for small to very big events. The Istanbul marathon (with the attached 15K, 10K and 6K funrun) had little over 106.000 runners (!!) and we had 8 timing locations on the track.
Very slowly restriction are lifted so that some form of events is possible. In April and May we have done a lot of local events for clubs involving the under 27 group of athletes. This group has virtually no restrictions (apart from travel for an event) when it comes to outdoor sporting. With restrictions being lifted even more will be possible!