Yes, will be a lot slower than the proprietary Huawei Supercharge
The P30 Pro also supports USB Power Delivery, although our testing kit rarely showed it going above around 1.3A at 9V, which works out to about 11.7W. There’s a chance a different Power Delivery charger would perform better, but this speed is only marginally better than standard 5V charging.
The P30 Pro can charge from any 5V USB charger, most of which now go up to between 2A and 2.4A. Under ideal circumstances, this should get you around 10W of charging power.