The phrase "declare progress" is correct and usable in written English.
You can use it when you want to announce or report advancements or improvements in a particular context, such as a project or personal development.
Example: "During the meeting, we will declare progress on our current initiatives and outline the next steps."
Alternatives: "report progress" or "announce progress."
Militant cells are actively working to undermine Yemen's weak government, even as U.S. and Yemeni officials declare progress in the fight against AQAP, as the al-Qaeda affiliate is known.
Long before President Obama had the idea, Calvin Coolidge made the journey to Cuba in 1928 — his only foreign trip as president — to address a conference of Western Hemisphere nations and declare "progress" and good will toward Cuba after a long period of strain.
Efforts to remove these limitations have filled many pages of research reports subsequently, and I think it is reasonable to declare progress in these respects.
He declares, "progress is possible".
Ann Carter, TANF unit manager at Georgia's Department of Human Services, looks at the plunge in her state's welfare rolls and declares progress.
Rear Adm. Rick Snyder, the director of the 21st Century Sailor's Office, declared progress in the overall decrease in military sex assaults — and said most units had a culture that discouraged such behavior.
So, it came as no surprise, just hours after Kerry departed Israel -- declaring progress in securing a truce between Israel and Hamas -- that the FAA cut short its 48-hour travel ban.
Ironically, however, shortly after the impasse was declared, progress became apparent due, above all, to the discovery of new archaeal phyla such as Korarchaeota [ 30], Thaumarchaeota and Aigarchaeota [ 31].
Science, Max Planck declared, progresses funeral by funeral.
Signing the Swiss trade continuity deal will enable ministers to declare that progress is being made, but deals with major trading partners including Canada, South Korea and Japan remain to be signed.
The N.H.L. and the players union remain so far apart that federal mediators declared no progress and left the negotiations after two days, the league announced Thursday afternoon.
