Hello,

Yes, you can prune now, but you may want to wait until this first flush of blossoms opens, then you can prune off the blooming branch when the roses are spent. Keep in mind that it is best not to prune roses after late August in the Mid-west.  Pruning stimulates growth, and later in the growing season this tender new growth tends to be more vulnerable to winter cold.  The best time to prune these roses is in spring when the forsythia blooms.  You can prune this type of rose pretty aggressively at that time as they are vigorous growers. Attached is a good resource for growing roses. (Note: it mentions a light fall pruning- this I would take to mean as removing spent flower stalks, but not removal of branches at that time of year)

https://extension.missouri.edu/publications/g6601

I hope this answers your questions. Thank you for contacting Ask Extension.

Ruth