Yes, DHL are still operating.
https://iexpressbydhl.com/enPlease note that for any shipments picked up on or after 1 Apr 2020, the Emergency Situation Surcharge will be levied until further notice. The final price will be displayed in the payment process.
Same for FedEx:
https://www.fedex.com/en-th/To continue providing our customers with the best possible service during this time, we are implementing a temporary surcharge on all FedEx Express international parcel and freight shipments beginning April 6, 2020.